90=39+x

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Solution for 90=39+x equation: 



90=39+x

We move all terms to the left:

90-(39+x)=0

We add all the numbers together, and all the variables

-(x+39)+90=0

We get rid of parentheses

-x-39+90=0

We add all the numbers together, and all the variables

-1x+51=0

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

-x=-51

x=-51/-1

x=+51

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