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90=-8x+6(1+6x)
We move all terms to the left:
90-(-8x+6(1+6x))=0
We add all the numbers together, and all the variables
-(-8x+6(6x+1))+90=0
We calculate terms in parentheses: -(-8x+6(6x+1)), so:We get rid of parentheses
-8x+6(6x+1)
We multiply parentheses
-8x+36x+6
We add all the numbers together, and all the variables
28x+6
Back to the equation:
-(28x+6)
-28x-6+90=0
We add all the numbers together, and all the variables
-28x+84=0
We move all terms containing x to the left, all other terms to the right
-28x=-84
x=-84/-28
x=+3
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