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x in (-oo:+oo)
y+0 = (-1/15)*(x+0) // - (-1/15)*(x+0)
y-((-1/15)*(x+0))+0 = 0
(1/15)*x+y = 0
1/15*x+y = 0 // - y
1/15*x = -y // : 1/15
x = -y/1/15
x = -15*y
x = -15*y
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