21=1/2x

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Solution for 21=1/2x equation: 


x in (-oo:+oo)

21 = (1/2)*x // - (1/2)*x

21-((1/2)*x) = 0

(-1/2)*x+21 = 0

21-1/2*x = 0 // - 21

-1/2*x = -21 // : -1/2

x = -21/(-1/2)

x = 42

x = 42

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