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3x+4(3x-7)=-13
We move all terms to the left:
3x+4(3x-7)-(-13)=0
We add all the numbers together, and all the variables
3x+4(3x-7)+13=0
We multiply parentheses
3x+12x-28+13=0
We add all the numbers together, and all the variables
15x-15=0
We move all terms containing x to the left, all other terms to the right
15x=15
x=15/15
x=1
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