7-7d+2d=-28

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Solution for 7-7d+2d=-28 equation: 


d in (-oo:+oo)

2*d-(7*d)+7 = -28 // + 28

2*d-(7*d)+7+28 = 0

2*d-7*d+7+28 = 0

35-5*d = 0 // - 35

-5*d = -35 // : -5

d = -35/(-5)

d = 7

d = 7

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