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9x-3x+87=9x+57
We move all terms to the left:
9x-3x+87-(9x+57)=0
We add all the numbers together, and all the variables
6x-(9x+57)+87=0
We get rid of parentheses
6x-9x-57+87=0
We add all the numbers together, and all the variables
-3x+30=0
We move all terms containing x to the left, all other terms to the right
-3x=-30
x=-30/-3
x=+10
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