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5x+3+2x=3x-9
We move all terms to the left:
5x+3+2x-(3x-9)=0
We add all the numbers together, and all the variables
7x-(3x-9)+3=0
We get rid of parentheses
7x-3x+9+3=0
We add all the numbers together, and all the variables
4x+12=0
We move all terms containing x to the left, all other terms to the right
4x=-12
x=-12/4
x=-3
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