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(3x+14)+(4x-20)=155
We move all terms to the left:
(3x+14)+(4x-20)-(155)=0
We get rid of parentheses
3x+4x+14-20-155=0
We add all the numbers together, and all the variables
7x-161=0
We move all terms containing x to the left, all other terms to the right
7x=161
x=161/7
x=23
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