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y in (-oo:+oo)
20 = (-5/9)*y // - (-5/9)*y
20-((-5/9)*y) = 0
(5/9)*y+20 = 0
5/9*y+20 = 0 // - 20
5/9*y = -20 // : 5/9
y = -20/5/9
y = -36
y = -36
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