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x-10+x-20+21+42+29+x+14+x=900
We move all terms to the left:
x-10+x-20+21+42+29+x+14+x-(900)=0
We add all the numbers together, and all the variables
4x-824=0
We move all terms containing x to the left, all other terms to the right
4x=824
x=824/4
x=206
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