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z in (-oo:+oo)
z/7 = 6/10 // - 6/10
z/7-(6/10) = 0
z/7-3/5 = 0
1/7*z-3/5 = 0 // + 3/5
1/7*z = 3/5 // : 1/7
z = 3/5/1/7
z = 21/5
z = 21/5
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