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z in (-oo:+oo)
(3*z)/8-(z/10) = 7 // - 7
(3*z)/8-(z/10)-7 = 0
11/40*z-7 = 0 // + 7
11/40*z = 7 // : 11/40
z = 7/11/40
z = 280/11
z = 280/11
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