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y in (-oo:+oo)
18 = (-3/5)*y // - (-3/5)*y
18-((-3/5)*y) = 0
(3/5)*y+18 = 0
3/5*y+18 = 0 // - 18
3/5*y = -18 // : 3/5
y = -18/3/5
y = -30
y = -30
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