step 1 LCD of 5 and 3 is 15
step2 convert the fractions to 15th's
-3/5 * 3/3 = -9/15
2/3 * 5/5 = 10/15
step3 -9/15 + 10/15 = (-9 + 10)/15
= 1/ 15 (answer)
-3/5 + 2/3
= -9/15 + 10/15 <=== same denominators
= (-9 + 10) / 15 <=== put the numerators together
= 1/15
