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(6x-15)+(x+8)=128
We move all terms to the left:
(6x-15)+(x+8)-(128)=0
We get rid of parentheses
6x+x-15+8-128=0
We add all the numbers together, and all the variables
7x-135=0
We move all terms containing x to the left, all other terms to the right
7x=135
x=135/7
x=19+2/7
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