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-84+4x=8x+6
We move all terms to the left:
-84+4x-(8x+6)=0
We get rid of parentheses
4x-8x-6-84=0
We add all the numbers together, and all the variables
-4x-90=0
We move all terms containing x to the left, all other terms to the right
-4x=90
x=90/-4
x=-22+1/2
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