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z in (-oo:+oo)
14 = -z/2 // + -z/2
14-(-z/2) = 0
(1/2)*z+14 = 0
1/2*z+14 = 0 // - 14
1/2*z = -14 // : 1/2
z = -14/1/2
z = -28
z = -28
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