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(3x+39)+(5x+10)=115
We move all terms to the left:
(3x+39)+(5x+10)-(115)=0
We get rid of parentheses
3x+5x+39+10-115=0
We add all the numbers together, and all the variables
8x-66=0
We move all terms containing x to the left, all other terms to the right
8x=66
x=66/8
x=8+1/4
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