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z in (-oo:+oo)
(4*z)/10-8 = 7 // - 7
(4*z)/10-8-7 = 0
2/5*z-15 = 0 // + 15
2/5*z = 15 // : 2/5
z = 15/2/5
z = 75/2
z = 75/2
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