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Hi Lisa, in order to solve this equation you will need to focus on isolating "x" to one side of the equation and then proceed to solving for "x" as follows:

1. Expand left side of equation...

           3(x-4)--> 3x-12 now have 3x-12=18x

2. Isolate x to right side by subtracting 3x from both sides...

3x-3x-12=18x-3x --> -12 = 15x

3. Solve for x by dividing both sides by 15...

-12/15 = x