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3x+10+2x+40+3x+30=180
We move all terms to the left:
3x+10+2x+40+3x+30-(180)=0
We add all the numbers together, and all the variables
8x-100=0
We move all terms containing x to the left, all other terms to the right
8x=100
x=100/8
x=12+1/2
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