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(2x+20)+(5x)+(3x)=180
We move all terms to the left:
(2x+20)+(5x)+(3x)-(180)=0
We add all the numbers together, and all the variables
8x+(2x+20)-180=0
We get rid of parentheses
8x+2x+20-180=0
We add all the numbers together, and all the variables
10x-160=0
We move all terms containing x to the left, all other terms to the right
10x=160
x=160/10
x=16
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