9+b/2=13 - solution

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Solution for 9+b/2=13 equation:

b in (-oo:+oo)

b/2+9 = 13 // - 13

b/2-13+9 = 0

1/2*b-4 = 0 // + 4

1/2*b = 4 // : 1/2

b = 4/1/2

b = 8

b = 8

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