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x in (-oo:+oo)
y+6 = (-4/5)*(x-7) // - (-4/5)*(x-7)
y-((-4/5)*(x-7))+6 = 0
(4/5)*(x-7)+y+6 = 0
4/5*(x-7)+y+6 = 0
4/5*(x-7)+y+6 = 0
4/5*x+y-28/5+6 = 0
4/5*x+y+2/5 = 0
4/5*x+y+2/5 = 0
4/5*x+y+2/5 = 0 // - y+2/5
4/5*x = -(y+2/5) // : 4/5
x = (-(y+2/5))/4/5
x = -5/4*(y+2/5)
x = -5/4*(y+2/5)
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