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x in (-oo:+oo)
y+7 = (-5/4)*(x+12) // - (-5/4)*(x+12)
y-((-5/4)*(x+12))+7 = 0
(5/4)*(x+12)+y+7 = 0
5/4*(x+12)+y+7 = 0
5/4*(x+12)+y+7 = 0
5/4*x+y+7+15 = 0
5/4*x+y+22 = 0
5/4*x+y+22 = 0
5/4*x+y+22 = 0 // - y+22
5/4*x = -(y+22) // : 5/4
x = (-(y+22))/5/4
x = -4/5*(y+22)
x = -4/5*(y+22)
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