4z-4/5+5z+5/4=2z+48/20
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9z + 5/4 - 4/5 = 2z +24/20
9z - 2z + 9/20 = 24/20
7z = 24/20 - 9/20
7z = 15/20
z = 15/20*1/7
z = 15/140
z = 3/28
9z - 2z + 9/20 = 24/20
7z = 24/20 - 9/20
7z = 15/20
z = 15/20*1/7
z = 15/140
z = 3/28
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