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21+42+29+x+x-10+x-20+x+14=360
We move all terms to the left:
21+42+29+x+x-10+x-20+x+14-(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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