40-2x=-2

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Solution for 40-2x=-2 equation: 



40-2x=-2

We move all terms to the left:

40-2x-(-2)=0

We add all the numbers together, and all the variables

-2x+42=0

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

-2x=-42

x=-42/-2

x=+21

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