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(x-17)+(x+35)+(x+42)+x=380
We move all terms to the left:
(x-17)+(x+35)+(x+42)+x-(380)=0
We add all the numbers together, and all the variables
x+(x-17)+(x+35)+(x+42)-380=0
We get rid of parentheses
x+x+x+x-17+35+42-380=0
We add all the numbers together, and all the variables
4x-320=0
We move all terms containing x to the left, all other terms to the right
4x=320
x=320/4
x=80
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