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x in (-oo:+oo)
y = (-2/3)*x+30 // - (-2/3)*x+30
y-((-2/3)*x)-30 = 0
(2/3)*x+y-30 = 0
2/3*x+y-30 = 0 // - y-30
2/3*x = -(y-30) // : 2/3
x = (-(y-30))/2/3
x = 3/2*(30-y)
x = 3/2*(30-y)
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