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z in (-oo:+oo)
-12 = -((3/7)*z) // + (3/7)*z
(3/7)*z-12 = 0
3/7*z-12 = 0 // + 12
3/7*z = 12 // : 3/7
z = 12/3/7
z = 28
z = 28
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