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(15x+42)+(9x+12)=180
We move all terms to the left:
(15x+42)+(9x+12)-(180)=0
We get rid of parentheses
15x+9x+42+12-180=0
We add all the numbers together, and all the variables
24x-126=0
We move all terms containing x to the left, all other terms to the right
24x=126
x=126/24
x=5+1/4
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