D/2-7=20

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Solution for D/2-7=20 equation: 


D in (-oo:+oo)

D/2-7 = 20 // - 20

D/2-20-7 = 0

1/2*D-27 = 0 // + 27

1/2*D = 27 // : 1/2

D = 27/1/2

D = 54

D = 54

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