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z in (-oo:+oo)
-(z/5)-4/3 = 7/15 // - 7/15
-(z/5)-4/3-(7/15) = 0
-(z/5)-4/3-7/15 = 0
-1/5*z-9/5 = 0 // + 9/5
-1/5*z = 9/5 // : -1/5
z = 9/5/(-1/5)
z = -9
z = -9
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