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z in (-oo:+oo)
(-3/7)*z = 9/28 // - 9/28
(-3/7)*z-(9/28) = 0
(-3/7)*z-9/28 = 0
-3/7*z-9/28 = 0 // + 9/28
-3/7*z = 9/28 // : -3/7
z = 9/28/(-3/7)
z = -3/4
z = -3/4
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