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90=x+x-16
We move all terms to the left:
90-(x+x-16)=0
We add all the numbers together, and all the variables
-(2x-16)+90=0
We get rid of parentheses
-2x+16+90=0
We add all the numbers together, and all the variables
-2x+106=0
We move all terms containing x to the left, all other terms to the right
-2x=-106
x=-106/-2
x=+53
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