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3x-4(-2x+15)=30
We move all terms to the left:
3x-4(-2x+15)-(30)=0
We multiply parentheses
3x+8x-60-30=0
We add all the numbers together, and all the variables
11x-90=0
We move all terms containing x to the left, all other terms to the right
11x=90
x=90/11
x=8+2/11
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