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(3x+4)-(2x+9)=15
We move all terms to the left:
(3x+4)-(2x+9)-(15)=0
We get rid of parentheses
3x-2x+4-9-15=0
We add all the numbers together, and all the variables
x-20=0
We move all terms containing x to the left, all other terms to the right
x=20
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