15 = 3z - 6
15 + 6 = 3z
3z = 21
z = 7
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There is no equation (nor inequality) to be solved!
15 percent 0 equals 0; 0 percent 15 equals 0. Both the above are true
15-3 times 2 equals 15-6 equals 9.
30 divided by 2 equals 15 :)
15