3(5z_7)_2(9z_11)=4(8z_13)_7
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3 (5z-7)-2 (9z-11)=4 (8z-13)-7
15z-21-18z+22=32z-52-7
-3z+1=32z-59
-3z-32z=-59-1
-35z=-60
35z=60
z=60/35
z=12/7
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