12-2x=90

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Solution for 12-2x=90 equation: 



12-2x=90

We move all terms to the left:

12-2x-(90)=0

We add all the numbers together, and all the variables

-2x-78=0

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

-2x=78

x=78/-2

x=-39

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