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2x-5(x+3)=9
We move all terms to the left:
2x-5(x+3)-(9)=0
We multiply parentheses
2x-5x-15-9=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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