(90-x)-x=12

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Solution for (90-x)-x=12 equation: 



(90-x)-x=12

We move all terms to the left:

(90-x)-x-(12)=0

We add all the numbers together, and all the variables

(-1x+90)-x-12=0

We add all the numbers together, and all the variables

-1x+(-1x+90)-12=0

We get rid of parentheses

-1x-1x+90-12=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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