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z in (-oo:+oo)
4/3 = (2*z)/15 // - (2*z)/15
4/3-((2*z)/15) = 0
(-2/15)*z+4/3 = 0
4/3-2/15*z = 0 // - 4/3
-2/15*z = -4/3 // : -2/15
z = -4/3/(-2/15)
z = 10
z = 10
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