90=120+x

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Solution for 90=120+x equation: 



90=120+x

We move all terms to the left:

90-(120+x)=0

We add all the numbers together, and all the variables

-(x+120)+90=0

We get rid of parentheses

-x-120+90=0

We add all the numbers together, and all the variables

-1x-30=0

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

-x=30

x=30/-1

x=-30

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