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(6x+3)+(4x+39)=180
We move all terms to the left:
(6x+3)+(4x+39)-(180)=0
We get rid of parentheses
6x+4x+3+39-180=0
We add all the numbers together, and all the variables
10x-138=0
We move all terms containing x to the left, all other terms to the right
10x=138
x=138/10
x=13+4/5
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