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(3x+5)+(x)=65
We move all terms to the left:
(3x+5)+(x)-(65)=0
We add all the numbers together, and all the variables
x+(3x+5)-65=0
We get rid of parentheses
x+3x+5-65=0
We add all the numbers together, and all the variables
4x-60=0
We move all terms containing x to the left, all other terms to the right
4x=60
x=60/4
x=15
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