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4x+3(5x+10)=-84
We move all terms to the left:
4x+3(5x+10)-(-84)=0
We add all the numbers together, and all the variables
4x+3(5x+10)+84=0
We multiply parentheses
4x+15x+30+84=0
We add all the numbers together, and all the variables
19x+114=0
We move all terms containing x to the left, all other terms to the right
19x=-114
x=-114/19
x=-6
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