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z in (-oo:+oo)
(-7/10)*z = 14/20 // - 14/20
(-7/10)*z-(14/20) = 0
(-7/10)*z-7/10 = 0
-7/10*z-7/10 = 0 // + 7/10
-7/10*z = 7/10 // : -7/10
z = 7/10/(-7/10)
z = -1
z = -1
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