7d+7=63

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Solution for 7d+7=63 equation: 


d in (-oo:+oo)

7*d+7 = 63 // - 63

7*d-63+7 = 0

7*d-56 = 0 // + 56

7*d = 56 // : 7

d = 56/7

d = 8

d = 8

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