21=x+2X+1/2X

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Solution for 21=x+2X+1/2X equation: 


x in (-oo:+oo)

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

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

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

21-5/2*X-x = 0 // - 21-5/2*X

-x = -(21-5/2*X) // * -1

x = 21-5/2*X

x = 21-5/2*X

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