-7b=-21

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Solution for -7b=-21 equation: 


b in (-oo:+oo)

-7*b = -21 // + 21

21-7*b = 0

21-7*b = 0 // - 21

-7*b = -21 // : -7

b = -21/(-7)

b = 3

b = 3

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