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y in (-oo:+oo)
30 = (-5/9)*y // - (-5/9)*y
30-((-5/9)*y) = 0
(5/9)*y+30 = 0
5/9*y+30 = 0 // - 30
5/9*y = -30 // : 5/9
y = -30/5/9
y = -54
y = -54
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