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y in (-oo:+oo)
y/15 = -3/5 // + -3/5
y/15-(-3/5) = 0
y/15+3/5 = 0
1/15*y+3/5 = 0 // - 3/5
1/15*y = -3/5 // : 1/15
y = -3/5/1/15
y = -9
y = -9
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