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x-20+x+14+x-10+x+21+42+29=360
We move all terms to the left:
x-20+x+14+x-10+x+21+42+29-(360)=0
We add all the numbers together, and all the variables
4x-284=0
We move all terms containing x to the left, all other terms to the right
4x=284
x=284/4
x=71
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