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z in (-oo:+oo)
(3*z+5)/6-2 = 7 // - 7
(3*z+5)/6-7-2 = 0
(3*z+5)/6+(-7*6)/6+(-2*6)/6 = 0
3*z-7*6-2*6+5 = 0
3*z-37-12 = 0
3*z-49 = 0
(3*z-49)/6 = 0
(3*z-49)/6 = 0 // * 6
3*z-49 = 0
3*z-49 = 0 // + 49
3*z = 49 // : 3
z = 49/3
z = 49/3
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