Today is my birthday and I'm three times older than I was six years ago. What is my age?
We know that my age divided by three is equal to my age minus six therefore X/3 = X-6 where X = My age
This means that X = 3X - 18 because we can multiply both sides by 3
This also means that -2X=-18 because we can subtract 3X from the right side.
Therefore X = 9 because - 18/-2 = <<-18/-2=9>>9
#### 9