7+5=-2x

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Solution for 7+5=-2x equation: 



7+5=-2x

We move all terms to the left:

7+5-(-2x)=0

We add all the numbers together, and all the variables

-(-2x)+12=0

We get rid of parentheses

2x+12=0

We move all terms containing x to the left, all other terms to the right

2x=-12

x=-12/2

x=-6

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