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z in (-oo:+oo)
-6 = (-2/7)*z // - (-2/7)*z
-((-2/7)*z)-6 = 0
(2/7)*z-6 = 0
2/7*z-6 = 0 // + 6
2/7*z = 6 // : 2/7
z = 6/2/7
z = 21
z = 21
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