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(3x+11)+(5x+9)=180
We move all terms to the left:
(3x+11)+(5x+9)-(180)=0
We get rid of parentheses
3x+5x+11+9-180=0
We add all the numbers together, and all the variables
8x-160=0
We move all terms containing x to the left, all other terms to the right
8x=160
x=160/8
x=20
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