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2x+4+4x-12=2x+40
We move all terms to the left:
2x+4+4x-12-(2x+40)=0
We add all the numbers together, and all the variables
6x-(2x+40)-8=0
We get rid of parentheses
6x-2x-40-8=0
We add all the numbers together, and all the variables
4x-48=0
We move all terms containing x to the left, all other terms to the right
4x=48
x=48/4
x=12
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