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3(-4+x)-5x=7x+15
We move all terms to the left:
3(-4+x)-5x-(7x+15)=0
We add all the numbers together, and all the variables
3(x-4)-5x-(7x+15)=0
We add all the numbers together, and all the variables
-5x+3(x-4)-(7x+15)=0
We multiply parentheses
-5x+3x-(7x+15)-12=0
We get rid of parentheses
-5x+3x-7x-15-12=0
We add all the numbers together, and all the variables
-9x-27=0
We move all terms containing x to the left, all other terms to the right
-9x=27
x=27/-9
x=-3
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