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y in (-oo:+oo)
-15/7 = 5*y // - 5*y
-(5*y)-15/7 = 0
-5*y-15/7 = 0
-5*y-15/7 = 0 // + 15/7
-5*y = 15/7 // : -5
y = 15/7/(-5)
y = -3/7
y = -3/7
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