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x in (-oo:+oo)
y = (4*x-6*a)/2 // - (4*x-6*a)/2
y-((4*x-6*a)/2) = 0
(-1*(4*x-6*a))/2+y = 0
(-1*(4*x-6*a))/2+(2*y)/2 = 0
2*y-1*(4*x-6*a) = 0
6*a-4*x+2*y = 0
(6*a-4*x+2*y)/2 = 0
(6*a-4*x+2*y)/2 = 0 // * 2
6*a-4*x+2*y = 0
6*a-4*x+2*y = 0 // - 6*a+2*y
-4*x = -(6*a+2*y) // : -4
x = (-(6*a+2*y))/(-4)
x = (6*a+2*y)/4
x = (6*a+2*y)/4
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