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(3x+19)+(2x+20)+8x+12)=180
We move all terms to the left:
(3x+19)+(2x+20)+8x+12)-(180)=0
We add all the numbers together, and all the variables
8x+(3x+19)+(2x+20)=0
We get rid of parentheses
8x+3x+2x+19+20=0
We add all the numbers together, and all the variables
13x+39=0
We move all terms containing x to the left, all other terms to the right
13x=-39
x=-39/13
x=-3
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