4b+1=21

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Solution for 4b+1=21 equation: 


b in (-oo:+oo)

4*b+1 = 21 // - 21

4*b-21+1 = 0

4*b-20 = 0 // + 20

4*b = 20 // : 4

b = 20/4

b = 5

b = 5

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