D=9+x/2

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Solution for D=9+x/2 equation: 


x in (-oo:+oo)

D = x/2+9 // - x/2+9

D-(x/2)-9 = 0

D-1/2*x-9 = 0 // - D-9

-1/2*x = -(D-9) // : -1/2

x = (-(D-9))/(-1/2)

x = -2*(9-D)

x = -2*(9-D)

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