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z in (-oo:+oo)
(3*z+5)/7 = 5 // - 5
(3*z+5)/7-5 = 0
(3*z+5)/7+(-5*7)/7 = 0
3*z-5*7+5 = 0
3*z-30 = 0
(3*z-30)/7 = 0
(3*z-30)/7 = 0 // * 7
3*z-30 = 0
3*z-30 = 0 // + 30
3*z = 30 // : 3
z = 30/3
z = 10
z = 10
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