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