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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-((1/2)*y) = 5/4 // - 5/4
2/x-((1/2)*y)-(5/4) = 0
2/x+(-1/2)*y-5/4 = 0
2*x^-1 = -(-1/2*y-5/4) // : 2
x^-1 = (5/4-(-1/2*y))/2
-1 < 0
1/(x^1) = (5/4-(-1/2*y))/2 // * x^1
1 = x^1*((5/4-(-1/2*y))/2) // : (5/4-(-1/2*y))/2
2*(1/2*y+5/4)^-1 = x^1
x = 2*(1/2*y+5/4)^-1
x = 2*(1/2*y+5/4)^-1
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