40-x=-12

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Solution for 40-x=-12 equation: 



40-x=-12

We move all terms to the left:

40-x-(-12)=0

We add all the numbers together, and all the variables

-1x+52=0

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

-x=-52

x=-52/-1

x=+52

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