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(14x+15)+(x)=90
We move all terms to the left:
(14x+15)+(x)-(90)=0
We add all the numbers together, and all the variables
x+(14x+15)-90=0
We get rid of parentheses
x+14x+15-90=0
We add all the numbers together, and all the variables
15x-75=0
We move all terms containing x to the left, all other terms to the right
15x=75
x=75/15
x=5
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