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(5x+14)+(3x+8)=142
We move all terms to the left:
(5x+14)+(3x+8)-(142)=0
We get rid of parentheses
5x+3x+14+8-142=0
We add all the numbers together, and all the variables
8x-120=0
We move all terms containing x to the left, all other terms to the right
8x=120
x=120/8
x=15
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