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4x+2(x+3)=3x-9
We move all terms to the left:
4x+2(x+3)-(3x-9)=0
We multiply parentheses
4x+2x-(3x-9)+6=0
We get rid of parentheses
4x+2x-3x+9+6=0
We add all the numbers together, and all the variables
3x+15=0
We move all terms containing x to the left, all other terms to the right
3x=-15
x=-15/3
x=-5
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