A.) 3
B.) 6
C.) 9
D.) 15
E.) 18
If b  3 = 6
b = 9 {added 3 to both sides}
If a  b = b  3, and b is 9
a  9 = 9  3 {substituted 9 in for b}
a  9 = 6 {subtracted on right side}
a = 15 {added 9 to both sides}
D.) 15
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