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x in (-oo:+oo)
y = 3/2-7.5*x // - 3/2-7.5*x
y-(-7.5*x)-(3/2) = 0
7.5*x+y-3/2 = 0
7.5*x+y-3/2 = 0 // - y-3/2
7.5*x = -(y-3/2) // : 7.5
x = (-(y-3/2))/7.5
x = 0.13333333*(3/2-y)
x = 0.13333333*(3/2-y)
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