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x+(3x-12)+(3x+3x-12)+(3x+3x+3x-12)=87
We move all terms to the left:
x+(3x-12)+(3x+3x-12)+(3x+3x+3x-12)-(87)=0
We add all the numbers together, and all the variables
x+(3x-12)+(6x-12)+(9x-12)-87=0
We get rid of parentheses
x+3x+6x+9x-12-12-12-87=0
We add all the numbers together, and all the variables
19x-123=0
We move all terms containing x to the left, all other terms to the right
19x=123
x=123/19
x=6+9/19
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