4b-9=b+21 - solution

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Solution for 4b-9=b+21 equation:

b in (-oo:+oo)

4*b-9 = b+21 // - b+21

4*b-b-21-9 = 0

3*b-30 = 0 // + 30

3*b = 30 // : 3

b = 30/3

b = 10

b = 10

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