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x in (-oo:+oo)
(1/5)*x+(3/8)*y = 1/2 // - 1/2
(1/5)*x+(3/8)*y-(1/2) = 0
(1/5)*x+(3/8)*y-1/2 = 0
1/5*x+3/8*y-1/2 = 0 // - 3/8*y-1/2
1/5*x = -(3/8*y-1/2) // : 1/5
x = (-(3/8*y-1/2))/1/5
x = 5*(1/2-(3/8*y))
x = 5*(1/2-(3/8*y))
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