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-5x+4(3x-5)=15
We move all terms to the left:
-5x+4(3x-5)-(15)=0
We multiply parentheses
-5x+12x-20-15=0
We add all the numbers together, and all the variables
7x-35=0
We move all terms containing x to the left, all other terms to the right
7x=35
x=35/7
x=5
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