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x in (-oo:+oo)
(-1/2)*x+(3/8)*y = 5/4 // - 5/4
(-1/2)*x+(3/8)*y-(5/4) = 0
(-1/2)*x+(3/8)*y-5/4 = 0
3/8*y-1/2*x-5/4 = 0 // - 3/8*y-5/4
-1/2*x = -(3/8*y-5/4) // : -1/2
x = (-(3/8*y-5/4))/(-1/2)
x = -2*(5/4-(3/8*y))
x = -2*(5/4-(3/8*y))
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