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15+(6x+3)+7x=40
We move all terms to the left:
15+(6x+3)+7x-(40)=0
We add all the numbers together, and all the variables
7x+(6x+3)-25=0
We get rid of parentheses
7x+6x+3-25=0
We add all the numbers together, and all the variables
13x-22=0
We move all terms containing x to the left, all other terms to the right
13x=22
x=22/13
x=1+9/13
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