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3x+2(5x-7)-12-4(x-3)=0
We multiply parentheses
3x+10x-4x-14+12-12=0
We add all the numbers together, and all the variables
9x-14=0
We move all terms containing x to the left, all other terms to the right
9x=14
x=14/9
x=1+5/9
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