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x in (-oo:+oo)
y = (2/5)*x+15 // - (2/5)*x+15
y-((2/5)*x)-15 = 0
(-2/5)*x+y-15 = 0
y-2/5*x-15 = 0 // - y-15
-2/5*x = -(y-15) // : -2/5
x = (-(y-15))/(-2/5)
x = -5/2*(15-y)
x = -5/2*(15-y)
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