X+x/2=21 - solution

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Solution for X+x/2=21 equation:

x in (-oo:+oo)

X+x/2 = 21 // - 21

X+x/2-21 = 0

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

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

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

x = 2*(21-X)

x = 2*(21-X)

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