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4x+(5x+3)=84
We move all terms to the left:
4x+(5x+3)-(84)=0
We get rid of parentheses
4x+5x+3-84=0
We add all the numbers together, and all the variables
9x-81=0
We move all terms containing x to the left, all other terms to the right
9x=81
x=81/9
x=9
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