-61/12= b - 4/3
add 4/3 to both sides
-61/12 + 4/3= b
convert 4/3 to like denominator; 3 goes into 12 four times and 4*4= 16/12
-61/12 + 16/12= b
combine numerators
(-61 + 16)/12= b
-45/12= b
simplify by 3
-15/4= b
ANSWER: -15/4= b
Hope this helps! :)