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