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z in (-oo:+oo)
-3/14 = (-3/7)*z // - (-3/7)*z
-((-3/7)*z)-3/14 = 0
(3/7)*z-3/14 = 0
3/7*z-3/14 = 0 // + 3/14
3/7*z = 3/14 // : 3/7
z = 3/14/3/7
z = 1/2
z = 1/2
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