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y in (-oo:+oo)
(-12/17)*y = 3 // - 3
(-12/17)*y-3 = 0
-12/17*y-3 = 0 // + 3
-12/17*y = 3 // : -12/17
y = 3/(-12/17)
y = -17/4
y = -17/4
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