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(7x)+(5x+14)=105
We move all terms to the left:
(7x)+(5x+14)-(105)=0
We get rid of parentheses
7x+5x+14-105=0
We add all the numbers together, and all the variables
12x-91=0
We move all terms containing x to the left, all other terms to the right
12x=91
x=91/12
x=7+7/12
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