5y - 4+y=17 + 4y - 5y

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Combine 4y and 5y to get 5y -4+ y = -y.  Combine y and 5y to get 6y -4 = -y.  Take -y across the equation sign to get 7y -4 = 0.  Then take -4 across the equation sign to get 7y = 4.  Finally, divide by 7 to get y = 4 over 7.
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