7(3b-9)=-84

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Solution for 7(3b-9)=-84 equation: 


b in (-oo:+oo)

7*(3*b-9) = -84 // + 84

7*(3*b-9)+84 = 0

7*(3*b-9)+84 = 0

21*b+21 = 0

21*b+21 = 0

21*b+21 = 0 // - 21

21*b = -21 // : 21

b = -21/21

b = -1

b = -1

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