5d-7+4d=56

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Solution for 5d-7+4d=56 equation: 


d in (-oo:+oo)

5*d+4*d-7 = 56 // - 56

5*d+4*d-56-7 = 0

9*d-63 = 0 // + 63

9*d = 63 // : 9

d = 63/9

d = 7

d = 7

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