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87=3(3x+3)+6
We move all terms to the left:
87-(3(3x+3)+6)=0
We calculate terms in parentheses: -(3(3x+3)+6), so:We get rid of parentheses
3(3x+3)+6
We multiply parentheses
9x+9+6
We add all the numbers together, and all the variables
9x+15
Back to the equation:
-(9x+15)
-9x-15+87=0
We add all the numbers together, and all the variables
-9x+72=0
We move all terms containing x to the left, all other terms to the right
-9x=-72
x=-72/-9
x=+8
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