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y in (-oo:+oo)
-12 = (-6/5)*y // - (-6/5)*y
-((-6/5)*y)-12 = 0
(6/5)*y-12 = 0
6/5*y-12 = 0 // + 12
6/5*y = 12 // : 6/5
y = 12/6/5
y = 10
y = 10
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