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According to order of operations the answer should be $\mathbf{2}$

But Google and Wolfram calculates as 8

**This is last proccess: $5-0+3$**

This is how I think: $5-(0+3)$

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This is how Google answers: $(5-0)+3$

So, question is which operation is first $+$ or $-$?

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You proceed from left to right down the hierarchy.

$$5- 0\cdot3 + 9/3 = 5 – 0 + 3 = 5 + 3 = 8.$$

You make the mistake of distributing the $-$ to two terms in the absence of parentheses.

The operations + and – have the same priority, therefore google is right: $a – b + c$ is read as $(a-b) + c$.

The $0$ is meant to “confuse” but if you write things in a very explicit $+,\times$ only notation it gets clearer:

$$\begin{align}

&5-0\times 3+9/3 =\\

&5 + (-1)\times 0\times 3 + 9/3 =\\

& 5 + 0 + 3 = 8

\end{align}$$

Remember that $a-b$ is actually $a+(-1)b$, and multiplication takes precedence over addition, so $(-1)\times 0 + 3$ is not the same as $(-1)\times(0+3)$.

$\times$ and $\div$ are higher precedence than $+$ and $-$, but each are associated left-to-right. First, the multiplication and division. Next, the leftmost addition/subtraction. Finally, the last addition.

$$

\begin{array}{c}

5-\color{#C00000}{0\times3}+\color{#C00000}{9/3}\\

\color{#C00000}{5-0}+3\\

\color{#C00000}{5+3}\\

8

\end{array}

$$

$$5-(0+3)=5-0-3=2$$

but

$$(5-0)+3=5-0+3=8$$

There’s no priority between $+$ and $-$, but most people prefer to start from right to do the calculation.

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