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90=x+(16x+39)
We move all terms to the left:
90-(x+(16x+39))=0
We calculate terms in parentheses: -(x+(16x+39)), so:We get rid of parentheses
x+(16x+39)
We get rid of parentheses
x+16x+39
We add all the numbers together, and all the variables
17x+39
Back to the equation:
-(17x+39)
-17x-39+90=0
We add all the numbers together, and all the variables
-17x+51=0
We move all terms containing x to the left, all other terms to the right
-17x=-51
x=-51/-17
x=+3
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