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3(5z-7)-2(9z-11)=4(8z-13)-17
15z-21-18z+22=32z-52-17
15z-18z-32z=21-22-52-17
-3z-32z=(-1)-52-17
-35z=(-53)-17
-35z=(-70)
z=(-70)/(-35)
z=14/7
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