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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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