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5x+30+2x+30+3x+20=180
We move all terms to the left:
5x+30+2x+30+3x+20-(180)=0
We add all the numbers together, and all the variables
10x-100=0
We move all terms containing x to the left, all other terms to the right
10x=100
x=100/10
x=10
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