X/2-1=20 - solution

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Solution for X/2-1=20 equation:

X in (-oo:+oo)

X/2-1 = 20 // - 20

X/2-20-1 = 0

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

1/2*X = 21 // : 1/2

X = 21/1/2

X = 42

X = 42

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