7(-1d+9)=-21

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Solution for 7(-1d+9)=-21 equation: 


d in (-oo:+oo)

7*(9-1*d) = -21 // + 21

7*(9-1*d)+21 = 0

7*(9-d)+21 = 0

7*(9-d)+21 = 0

84-7*d = 0

84-7*d = 0

84-7*d = 0 // - 84

-7*d = -84 // : -7

d = -84/(-7)

d = 12

d = 12

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