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z in (-oo:+oo)
(-6*z)/8+7/8 = (6*z)/5-((2*z)/3)-(11/5) // - (6*z)/5-((2*z)/3)-(11/5)
(-6*z)/8-((6*z)/5)+(2*z)/3+7/8+11/5 = 0
(-6*z)/8+(-6/5)*z+(2*z)/3+7/8+11/5 = 0
123/40-77/60*z = 0 // - 123/40
-77/60*z = -123/40 // : -77/60
z = -123/40/(-77/60)
z = 369/154
z = 369/154
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