Multiply all terms in the equation by a number that divides all of the denominators. For instance, in the equation (x/3) - (2x/5) = -7/15, the number 15 will divide all three denominators (3, 5 and 15) with no remainder. Multiplying both sides of the equation by 15 yields 5x - 6x = -7.
Combine all x terms to obtain -x = -7.
Simplify the equation further, to obtain x alone. Here, you would multiply both sides of the equation by -1 to find that x = 7.