55=15+1/2D

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Solution for 55=15+1/2D equation: 


D in (-oo:+oo)

55 = (1/2)*D+15 // - (1/2)*D+15

55-((1/2)*D)-15 = 0

(-1/2)*D-15+55 = 0

40-1/2*D = 0 // - 40

-1/2*D = -40 // : -1/2

D = -40/(-1/2)

D = 80

D = 80

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