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y-1+2y-5+3y-9=270
We move all terms to the left:
y-1+2y-5+3y-9-(270)=0
We add all the numbers together, and all the variables
6y-285=0
We move all terms containing y to the left, all other terms to the right
6y=285
y=285/6
y=47+1/2
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