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(2x+7)+6x+5)=84
We move all terms to the left:
(2x+7)+6x+5)-(84)=0
We add all the numbers together, and all the variables
6x+(2x+7)=0
We get rid of parentheses
6x+2x+7=0
We add all the numbers together, and all the variables
8x+7=0
We move all terms containing x to the left, all other terms to the right
8x=-7
x=-7/8
x=-7/8
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