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z in (-oo:+oo)
(4*z)/10-1 = 6 // - 6
(4*z)/10-6-1 = 0
2/5*z-7 = 0 // + 7
2/5*z = 7 // : 2/5
z = 7/2/5
z = 35/2
z = 35/2
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