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5x+10(x-3)=15
We move all terms to the left:
5x+10(x-3)-(15)=0
We multiply parentheses
5x+10x-30-15=0
We add all the numbers together, and all the variables
15x-45=0
We move all terms containing x to the left, all other terms to the right
15x=45
x=45/15
x=3
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