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2y-7+2y-27+135+y+44+2y+2y+135+y+50=900
We move all terms to the left:
2y-7+2y-27+135+y+44+2y+2y+135+y+50-(900)=0
We add all the numbers together, and all the variables
10y-570=0
We move all terms containing y to the left, all other terms to the right
10y=570
y=570/10
y=57
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