3(5z-7)-9(2z-11)=4(8z-13)-17
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3(5z - 7) - 9(2z -11) = 4(8z-13) - 17
15z - 21 - 18z + 99 = 32z -52 - 17
-3z + 78 = 32z - 69
35z = 147
z = 147/35 = 21/5
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