-72=-90+x

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Solution for -72=-90+x equation: 



-72=-90+x

We move all terms to the left:

-72-(-90+x)=0

We add all the numbers together, and all the variables

-(x-90)-72=0

We get rid of parentheses

-x+90-72=0

We add all the numbers together, and all the variables

-1x+18=0

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

-x=-18

x=-18/-1

x=+18

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