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(16x-6)+(13x+9)=84
We move all terms to the left:
(16x-6)+(13x+9)-(84)=0
We get rid of parentheses
16x+13x-6+9-84=0
We add all the numbers together, and all the variables
29x-81=0
We move all terms containing x to the left, all other terms to the right
29x=81
x=81/29
x=2+23/29
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