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90=64+13x
We move all terms to the left:
90-(64+13x)=0
We add all the numbers together, and all the variables
-(13x+64)+90=0
We get rid of parentheses
-13x-64+90=0
We add all the numbers together, and all the variables
-13x+26=0
We move all terms containing x to the left, all other terms to the right
-13x=-26
x=-26/-13
x=+2
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