Most importantly, while including divisions with various denominators, the initial step says that we should change these portions so they have "a similar denominator" .Here are the means for including divisions with various denominators .Construct each portion with the goal that the two denominators are equivalent. Keep in mind, while including divisions with various denominators, the denominators must be the same. So we should finish this progression first. a. Re-compose every proportionate division utilizing this new denominator b. Now you can include the numerators, and keep the denominator of the proportionate divisions. c. Re-compose your answer as a streamlined or decreased division, if necessary. We know this sound like a great deal of work, and it is, yet once you see completely how to locate the Common Denominator or the LCD, and manufacture proportional parts, everything else will begin to become all-good. Thus, how about we set aside our opportunity to do it. Solution: 5b/4a + b/3a -3b/a =15b/12a + 4b/12a – 36b/12a = -17b/12 a Or = - 1 5b/12a in lowest term.