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15=-4x+9+2x
We move all terms to the left:
15-(-4x+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+6=0
We move all terms containing x to the left, all other terms to the right
2x=-6
x=-6/2
x=-3
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