Question 698642
x = Bob's age now
x + 3 = Bob's age in 3 years
x - 3 = Bob's age 3 years ago


x + 3 = 3(x - 3)   {three years from now (x + 3), Bob will be 3 times his age 3 years ago (x - 3)}
x + 3 = 3x - 9   {used distributive property}
12 = 2x   {subtracted x and added 9 to each side}
x = 6   {divided each side by 2}


Bob is 6 now
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