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z in (-oo:+oo)
(3*z)/7-7 = -8 // + 8
(3*z)/7-7+8 = 0
3/7*z+1 = 0 // - 1
3/7*z = -1 // : 3/7
z = -1/3/7
z = -7/3
z = -7/3
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