-b+3=-3b+21

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Solution for -b+3=-3b+21 equation: 


b in (-oo:+oo)

3-b = 21-3*b // - 21-3*b

3-b-(-3*b)-21 = 0

3*b-b-21+3 = 0

2*b-18 = 0 // + 18

2*b = 18 // : 2

b = 18/2

b = 9

b = 9

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