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2x+4(-5x+6)=-84
We move all terms to the left:
2x+4(-5x+6)-(-84)=0
We add all the numbers together, and all the variables
2x+4(-5x+6)+84=0
We multiply parentheses
2x-20x+24+84=0
We add all the numbers together, and all the variables
-18x+108=0
We move all terms containing x to the left, all other terms to the right
-18x=-108
x=-108/-18
x=+6
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