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2x+10+x-20+x+40=180
We move all terms to the left:
2x+10+x-20+x+40-(180)=0
We add all the numbers together, and all the variables
4x-150=0
We move all terms containing x to the left, all other terms to the right
4x=150
x=150/4
x=37+1/2
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