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3(5x-6)-5(2x+3)=7
We move all terms to the left:
3(5x-6)-5(2x+3)-(7)=0
We multiply parentheses
15x-10x-18-15-7=0
We add all the numbers together, and all the variables
5x-40=0
We move all terms containing x to the left, all other terms to the right
5x=40
x=40/5
x=8
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