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(1/4)*(8*x-4)-((1/5)*(20*x-(6*y))) = 0
(1/4)*(8*x-4)+(-1/5)*(20*x-6*y) = 0
1/4*(8*x-4)-1/5*(20*x-6*y) = 0
1/4*(8*x-4)-1/5*(20*x-6*y) = 0
6/5*y-2*x-1 = 0
6/5*y-2*x-1 = 0
6/5*y-2*x-1 = 0 // - 6/5*y-1
-2*x = -(6/5*y-1) // : -2
x = (-(6/5*y-1))/(-2)
x = (1-(6/5*y))/(-2)
x = (1-(6/5*y))/(-2)
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