How do you do this geometry problem

If m and n are parallel, then that's like saying 3x-10 is equal to 5x-30 (or 3x-10 = 5x-30).

If that's the case, then You'll need to format the problem so you can solve for x. In order to solve this equation, we need to group all the variable terms on one side, and all of the constant terms on the other side of the equation.

So the -10, will be moved to the right side and the 5x will be moved to the left side. Also as each term that moves, it causes their signs to change.

So we now have the problem of 3x-5x=10-30. Now we can start to simplify the problem by combining like terms.

So 3x-5x  = -2x and 10-30=-20 or more simply -2x=-20

Now we need to isolate the variable x so it's on a side by itself.

The easiest way to do this is simply divide both sides by 2, which gives us 2x/2=20/2 or more simply, x=20/2.

So we're down to the simple problem of x=20/2 which equals 10.  So x=10.