U/2=-1 - solution

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Solution for U/2=-1 equation:

U in (-oo:+oo)

U/2 = -1 // + 1

U/2+1 = 0

1/2*U+1 = 0 // - 1

1/2*U = -1 // : 1/2

U = -1/1/2

U = -2

U = -2

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