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36+(x+20)+(3x)=180
We move all terms to the left:
36+(x+20)+(3x)-(180)=0
We add all the numbers together, and all the variables
3x+(x+20)-144=0
We get rid of parentheses
3x+x+20-144=0
We add all the numbers together, and all the variables
4x-124=0
We move all terms containing x to the left, all other terms to the right
4x=124
x=124/4
x=31
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