-3+7b+5b=21

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Solution for -3+7b+5b=21 equation: 


b in (-oo:+oo)

7*b+5*b-3 = 21 // - 21

7*b+5*b-21-3 = 0

12*b-24 = 0 // + 24

12*b = 24 // : 12

b = 24/12

b = 2

b = 2

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