1/7(7b-21)

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Solution for 1/7(7b-21) equation: 


b in (-oo:+oo)

(1/7)*(7*b-21) = 0

1/7*(7*b-21) = 0

( 1/7 )

1/7 = 0

b belongs to the empty set

( 7*b-21 )

7*b-21 = 0 // + 21

7*b = 21 // : 7

b = 21/7

b = 3

b = 3

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