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90=6x+8+7x-9
We move all terms to the left:
90-(6x+8+7x-9)=0
We add all the numbers together, and all the variables
-(13x-1)+90=0
We get rid of parentheses
-13x+1+90=0
We add all the numbers together, and all the variables
-13x+91=0
We move all terms containing x to the left, all other terms to the right
-13x=-91
x=-91/-13
x=+7
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