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2x+12=-3+5x-9
We move all terms to the left:
2x+12-(-3+5x-9)=0
We add all the numbers together, and all the variables
2x-(5x-12)+12=0
We get rid of parentheses
2x-5x+12+12=0
We add all the numbers together, and all the variables
-3x+24=0
We move all terms containing x to the left, all other terms to the right
-3x=-24
x=-24/-3
x=+8
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