-75=-90+x

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Solution for -75=-90+x equation: 



-75=-90+x

We move all terms to the left:

-75-(-90+x)=0

We add all the numbers together, and all the variables

-(x-90)-75=0

We get rid of parentheses

-x+90-75=0

We add all the numbers together, and all the variables

-1x+15=0

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

-x=-15

x=-15/-1

x=+15

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