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15=-9+2x
We move all terms to the left:
15-(-9+2x)=0
We add all the numbers together, and all the variables
-(2x-9)+15=0
We get rid of parentheses
-2x+9+15=0
We add all the numbers together, and all the variables
-2x+24=0
We move all terms containing x to the left, all other terms to the right
-2x=-24
x=-24/-2
x=+12
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