20=2d+d-10

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Solution for 20=2d+d-10 equation: 


d in (-oo:+oo)

20 = 2*d+d-10 // - 2*d+d-10

10-(2*d)-d+20 = 0

10-2*d-d+20 = 0

30-3*d = 0 // - 30

-3*d = -30 // : -3

d = -30/(-3)

d = 10

d = 10

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