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(3x-7)+(4x+19)=115
We move all terms to the left:
(3x-7)+(4x+19)-(115)=0
We get rid of parentheses
3x+4x-7+19-115=0
We add all the numbers together, and all the variables
7x-103=0
We move all terms containing x to the left, all other terms to the right
7x=103
x=103/7
x=14+5/7
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