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z in (-oo:+oo)
(-3/7)*z = 9/35 // - 9/35
(-3/7)*z-(9/35) = 0
(-3/7)*z-9/35 = 0
-3/7*z-9/35 = 0 // + 9/35
-3/7*z = 9/35 // : -3/7
z = 9/35/(-3/7)
z = -3/5
z = -3/5
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