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90=6x+7+11x-2
We move all terms to the left:
90-(6x+7+11x-2)=0
We add all the numbers together, and all the variables
-(17x+5)+90=0
We get rid of parentheses
-17x-5+90=0
We add all the numbers together, and all the variables
-17x+85=0
We move all terms containing x to the left, all other terms to the right
-17x=-85
x=-85/-17
x=+5
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