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-84+4x=-6x+66
We move all terms to the left:
-84+4x-(-6x+66)=0
We get rid of parentheses
4x+6x-66-84=0
We add all the numbers together, and all the variables
10x-150=0
We move all terms containing x to the left, all other terms to the right
10x=150
x=150/10
x=15
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