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x in (-oo:+oo)
Y-4 = (4/10)*(x-7) // - (4/10)*(x-7)
Y-((4/10)*(x-7))-4 = 0
(-2/5)*(x-7)+Y-4 = 0
Y-2/5*(x-7)-4 = 0
Y-2/5*(x-7)-4 = 0
Y-2/5*x-4+14/5 = 0
Y-2/5*x-6/5 = 0
Y-2/5*x-6/5 = 0
Y-2/5*x-6/5 = 0 // - Y-6/5
-2/5*x = -(Y-6/5) // : -2/5
x = (-(Y-6/5))/(-2/5)
x = -5/2*(6/5-Y)
x = -5/2*(6/5-Y)
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