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(2/5)*x+(3/10)*y = 10 // - 10
(2/5)*x+(3/10)*y-10 = 0
2/5*x+3/10*y-10 = 0 // - 3/10*y-10
2/5*x = -(3/10*y-10) // : 2/5
x = (-(3/10*y-10))/2/5
x = 5/2*(10-(3/10*y))
x = 5/2*(10-(3/10*y))
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