Question

4 3/12-r= 3 6/12

Answer 1

Just solve to get r by itself, subtract 4 3/12 from both sides of the equal sign and then divide by -1 to get r positive:

r= \[\frac{ 3 }{ 4 }\]

Answer 2

4 3/12 - r = 3 6/12 (I am going to turn the mixed numbers into improper fractions)
51/12 - r = 42/12
51/12 - 42/12 = r
9/12 = r (reduce)
3/4 = r