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x in (-oo:+oo)
y-6 = (3/4)*(x-20) // - (3/4)*(x-20)
y-((3/4)*(x-20))-6 = 0
(-3/4)*(x-20)+y-6 = 0
y-3/4*(x-20)-6 = 0
y-3/4*(x-20)-6 = 0
y-3/4*x-6+15 = 0
y-3/4*x+9 = 0
y-3/4*x+9 = 0
y-3/4*x+9 = 0 // - y+9
-3/4*x = -(y+9) // : -3/4
x = (-(y+9))/(-3/4)
x = 4/3*(y+9)
x = 4/3*(y+9)
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