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90=11x-13
We move all terms to the left:
90-(11x-13)=0
We get rid of parentheses
-11x+13+90=0
We add all the numbers together, and all the variables
-11x+103=0
We move all terms containing x to the left, all other terms to the right
-11x=-103
x=-103/-11
x=9+4/11
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