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7y+21/3+2y=20
We move all terms to the left:
7y+21/3+2y-(20)=0
determiningTheFunctionDomain 7y+2y-20+21/3=0
We add all the numbers together, and all the variables
9y-13=0
We move all terms containing y to the left, all other terms to the right
9y=13
y=13/9
y=1+4/9
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