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z in (-oo:+oo)
7/105 = (1/5)*z // - (1/5)*z
7/105-((1/5)*z) = 0
(-1/5)*z+7/105 = 0
1/15-1/5*z = 0 // - 1/15
-1/5*z = -1/15 // : -1/5
z = -1/15/(-1/5)
z = 1/3
z = 1/3
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