7d+7=-56

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Solution for 7d+7=-56 equation: 


d in (-oo:+oo)

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

7*d+7+56 = 0

7*d+63 = 0 // - 63

7*d = -63 // : 7

d = -63/7

d = -9

d = -9

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