2y=5y-21/2

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Solution for 2y=5y-21/2 equation: 


y in (-oo:+oo)

2*y = 5*y-(21/2) // - 5*y-(21/2)

2*y-(5*y)+21/2 = 0

2*y-5*y+21/2 = 0

21/2-3*y = 0 // - 21/2

-3*y = -21/2 // : -3

y = -21/2/(-3)

y = 7/2

y = 7/2

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