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