(x/2+6)+x/2=21 - solution

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Solution for (x/2+6)+x/2=21 equation:

x in (-oo:+oo)

x/2+x/2+6 = 21 // - 21

x/2+x/2-21+6 = 0

x-15 = 0 // + 15

x = 15

x = 15

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