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z in (-oo:+oo)
(1/15)*z = 3/7 // - 3/7
(1/15)*z-(3/7) = 0
(1/15)*z-3/7 = 0
1/15*z-3/7 = 0 // + 3/7
1/15*z = 3/7 // : 1/15
z = 3/7/1/15
z = 45/7
z = 45/7
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