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y in (-oo:+oo)
2*y = 5*y-(21/1) // - 5*y-(21/1)
2*y-(5*y)+21/1 = 0
2*y-5*y+21 = 0
21-3*y = 0 // - 21
-3*y = -21 // : -3
y = -21/(-3)
y = 7
y = 7
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