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If John has 5 apples, and he gives some to Joanna, and he has two apples left, how many did he give to Joanna?
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Answer:

John gave Joanna three apples.

Explanation

Well, the formula would be something like this:

$5 – x = 2$

To solve for $x$, we simply have to swap the $x$ and the $2$. What we’re actually doing is adding $x$ to both sides:

$5 – x + x = 2 + x$

this becomes:

$5 = 2 + x$

then we subtract $2$ from both sides to move the $2$ over:

$$5 – 2 = 2 – 2 + x$$

$$5 – 2=x$$

$$x=3$$

so John gave Joanna three apples

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