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x in (-oo:+oo)
y = (-4/3)*(x+7)-9 // - (-4/3)*(x+7)-9
y-((-4/3)*(x+7))+9 = 0
(4/3)*(x+7)+y+9 = 0
4/3*(x+7)+y+9 = 0
4/3*(x+7)+y+9 = 0
4/3*x+y+9+28/3 = 0
4/3*x+y+55/3 = 0
4/3*x+y+55/3 = 0
4/3*x+y+55/3 = 0 // - y+55/3
4/3*x = -(y+55/3) // : 4/3
x = (-(y+55/3))/4/3
x = -3/4*(y+55/3)
x = -3/4*(y+55/3)
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