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-84-126x=144-12x
We move all terms to the left:
-84-126x-(144-12x)=0
We add all the numbers together, and all the variables
-126x-(-12x+144)-84=0
We get rid of parentheses
-126x+12x-144-84=0
We add all the numbers together, and all the variables
-114x-228=0
We move all terms containing x to the left, all other terms to the right
-114x=228
x=228/-114
x=-2
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