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2(x+3)+4x-2x=30
We move all terms to the left:
2(x+3)+4x-2x-(30)=0
We add all the numbers together, and all the variables
2x+2(x+3)-30=0
We multiply parentheses
2x+2x+6-30=0
We add all the numbers together, and all the variables
4x-24=0
We move all terms containing x to the left, all other terms to the right
4x=24
x=24/4
x=6
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