-1/3(15b+21)

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Solution for -1/3(15b+21) equation: 


b in (-oo:+oo)

(-1/3)*(15*b+21) = 0

-1/3*(15*b+21) = 0

15*b+21 = 0 // - 21

15*b = -21 // : 15

b = -21/15

b = -7/5

b = -7/5

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