So, if you’re trying to solve 2/x = 10/13 for x, you’d have 2 * 13 = x * 10, or 26 = 10x.
So, combine 4x and 2x by subtracting 2x from both sides. Subtracting 2x from 2x on the right side will leave you with 0. On the left side, 4x - 2x = 2x, so you have 2x remaining. Now, combine 12 and 2 by subtracting 12 from both sides of the equation. Subtract 12 from 12 on the left and you’ll have 0, and subtract 12 from 2 on the right side to get 2-12 = -10. You’re left with 2x = -10.
