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y in (-oo:+oo)
-12 = (-3/5)*y // - (-3/5)*y
-((-3/5)*y)-12 = 0
(3/5)*y-12 = 0
3/5*y-12 = 0 // + 12
3/5*y = 12 // : 3/5
y = 12/3/5
y = 20
y = 20
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