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4x=12+6x+8=40
We move all terms to the left:
4x-(12+6x+8)=0
We add all the numbers together, and all the variables
4x-(6x+20)=0
We get rid of parentheses
4x-6x-20=0
We add all the numbers together, and all the variables
-2x-20=0
We move all terms containing x to the left, all other terms to the right
-2x=20
x=20/-2
x=-10
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