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z in (-oo:+oo)
(-2/7)*z = 10/7 // - 10/7
(-2/7)*z-(10/7) = 0
(-2/7)*z-10/7 = 0
-2/7*z-10/7 = 0 // + 10/7
-2/7*z = 10/7 // : -2/7
z = 10/7/(-2/7)
z = -5
z = -5
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