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