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x in (-oo:+oo)
y = 9-((4/3)*(x+12)) // - 9-((4/3)*(x+12))
(4/3)*(x+12)+y-9 = 0
4/3*(x+12)+y-9 = 0
4/3*(x+12)+y-9 = 0
4/3*x+y-9+16 = 0
4/3*x+y+7 = 0
4/3*x+y+7 = 0
4/3*x+y+7 = 0 // - y+7
4/3*x = -(y+7) // : 4/3
x = (-(y+7))/4/3
x = -3/4*(y+7)
x = -3/4*(y+7)
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