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z in (-oo:+oo)
2/5-3*z+6/5 = (7*z)/6 // - (7*z)/6
2/5-3*z-((7*z)/6)+6/5 = 0
(-7/6)*z-3*z+2/5+6/5 = 0
8/5-25/6*z = 0 // - 8/5
-25/6*z = -8/5 // : -25/6
z = -8/5/(-25/6)
z = 48/125
z = 48/125
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