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x in (-oo:+oo)
y+8 = (-3/10)*(x-4) // - (-3/10)*(x-4)
y-((-3/10)*(x-4))+8 = 0
(3/10)*(x-4)+y+8 = 0
3/10*(x-4)+y+8 = 0
3/10*(x-4)+y+8 = 0
3/10*x+y-6/5+8 = 0
3/10*x+y+34/5 = 0
3/10*x+y+34/5 = 0
3/10*x+y+34/5 = 0 // - y+34/5
3/10*x = -(y+34/5) // : 3/10
x = (-(y+34/5))/3/10
x = -10/3*(y+34/5)
x = -10/3*(y+34/5)
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