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(2/5)*y-(4*x) = 6 // - 6
(2/5)*y-(4*x)-6 = 0
(2/5)*y-4*x-6 = 0
2/5*y-4*x-6 = 0 // - 2/5*y-6
-4*x = -(2/5*y-6) // : -4
x = (-(2/5*y-6))/(-4)
x = (6-(2/5*y))/(-4)
x = (6-(2/5*y))/(-4)
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