Now, if you realise that , then the equation can be written as:

We need to get rid of the 3 and the 10 on the left hand side. The 10 is on the denominator, so to get rid of it, we need to multiply the expression by 10. But if we do that, we must ALSO multiply the right hand side of the equation by 10:

Now on the LHS, the 10s on the top and bottom will cancel, leaving:

Now we need to get rid of that 3. It's in the numerator, so to get rid of it, we must divide the LHS by 3, and we must also do that to the RHS.

The 3s on the LHS will cancel, and you should be able to calulate the RHS!