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y in (-oo:+oo)
21 = (-7/9)*y // - (-7/9)*y
21-((-7/9)*y) = 0
(7/9)*y+21 = 0
7/9*y+21 = 0 // - 21
7/9*y = -21 // : 7/9
y = -21/7/9
y = -27
y = -27
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