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y in (-oo:+oo)
21 = (3/2)*y // - (3/2)*y
21-((3/2)*y) = 0
(-3/2)*y+21 = 0
21-3/2*y = 0 // - 21
-3/2*y = -21 // : -3/2
y = -21/(-3/2)
y = 14
y = 14
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