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3x+2+x+20+x+4=180
We move all terms to the left:
3x+2+x+20+x+4-(180)=0
We add all the numbers together, and all the variables
5x-154=0
We move all terms containing x to the left, all other terms to the right
5x=154
x=154/5
x=30+4/5
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