4=d/7

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Solution for 4=d/7 equation: 


d in (-oo:+oo)

4 = d/7 // - d/7

4-(d/7) = 0

4-1/7*d = 0 // - 4

-1/7*d = -4 // : -1/7

d = -4/(-1/7)

d = 28

d = 28

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