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z in (-oo:+oo)
(3*z)/8-3 = 7 // - 7
(3*z)/8-7-3 = 0
3/8*z-10 = 0 // + 10
3/8*z = 10 // : 3/8
z = 10/3/8
z = 80/3
z = 80/3
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