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4x+6-120=7x+15
We move all terms to the left:
4x+6-120-(7x+15)=0
We add all the numbers together, and all the variables
4x-(7x+15)-114=0
We get rid of parentheses
4x-7x-15-114=0
We add all the numbers together, and all the variables
-3x-129=0
We move all terms containing x to the left, all other terms to the right
-3x=129
x=129/-3
x=-43
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