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2x+4(x+3)=6
We move all terms to the left:
2x+4(x+3)-(6)=0
We multiply parentheses
2x+4x+12-6=0
We add all the numbers together, and all the variables
6x+6=0
We move all terms containing x to the left, all other terms to the right
6x=-6
x=-6/6
x=-1
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