21y-1+71.8=180

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Solution for 21y-1+71.8=180 equation: 



21y-1+71.8=180

We move all terms to the left:

21y-1+71.8-(180)=0

We add all the numbers together, and all the variables

21y-109.2=0

We move all terms containing y to the left, all other terms to the right

21y=109.2

y=109.2/21

y=5+3.5/17.5

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