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15(2x-3)=45
We move all terms to the left:
15(2x-3)-(45)=0
We multiply parentheses
30x-45-45=0
We add all the numbers together, and all the variables
30x-90=0
We move all terms containing x to the left, all other terms to the right
30x=90
x=90/30
x=3
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