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(12x+1)+(14+x)=90
We move all terms to the left:
(12x+1)+(14+x)-(90)=0
We add all the numbers together, and all the variables
(12x+1)+(x+14)-90=0
We get rid of parentheses
12x+x+1+14-90=0
We add all the numbers together, and all the variables
13x-75=0
We move all terms containing x to the left, all other terms to the right
13x=75
x=75/13
x=5+10/13
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