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3(1-8x)+3x=87
We move all terms to the left:
3(1-8x)+3x-(87)=0
We add all the numbers together, and all the variables
3(-8x+1)+3x-87=0
We add all the numbers together, and all the variables
3x+3(-8x+1)-87=0
We multiply parentheses
3x-24x+3-87=0
We add all the numbers together, and all the variables
-21x-84=0
We move all terms containing x to the left, all other terms to the right
-21x=84
x=84/-21
x=-4
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