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6z=15x, z=15/6x=5/2x
3x+5y-2z = 23
3x+5(3/2x)-2(5/2x) = 23
3x+15/2x-10/2x = 23
11/2x = 23
x = (23×2)/11 = 46/11
y = 3/2x = (3/2).(46/11) = 69/11
z = 5/2x = (5/2).(46/11) = 115/11