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(x-9)+x+4x=87
We move all terms to the left:
(x-9)+x+4x-(87)=0
We add all the numbers together, and all the variables
5x+(x-9)-87=0
We get rid of parentheses
5x+x-9-87=0
We add all the numbers together, and all the variables
6x-96=0
We move all terms containing x to the left, all other terms to the right
6x=96
x=96/6
x=16
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