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2x-4+8=9x+4x-84
We move all terms to the left:
2x-4+8-(9x+4x-84)=0
We add all the numbers together, and all the variables
2x-(13x-84)-4+8=0
We add all the numbers together, and all the variables
2x-(13x-84)+4=0
We get rid of parentheses
2x-13x+84+4=0
We add all the numbers together, and all the variables
-11x+88=0
We move all terms containing x to the left, all other terms to the right
-11x=-88
x=-88/-11
x=+8
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