Arthur D. answered 01/18/18
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I'm guessing you mean 12 years and 4 times...
x=Brandon's age
x+12=Michael's age
(x+12)-17=4(x-17)
x-5=4x-68
68-5=4x-x
63=3x
x=63/3
x=21 years old for Brandon
x+12=33 years old for Michael
check: 33-17=16, 21-17=4 and 16 is 4 times 4