21=24/4+b

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Solution for 21=24/4+b equation: 


b in (-oo:+oo)

21 = b+24/4 // - b+24/4

21-b-(24/4) = 0

21-b-6 = 0

15-b = 0 // - 15

-b = -15 // * -1

b = 15

b = 15

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