Answer: (3, 5]
Explanation:
3w-3<=12 and 2w-1>5
3w-3+3<=12+3 and 2w-1+1>5+1
3w<=15 and 2w>6
3w/3<=15/3 and 2w/2>6/2
w<=5 and w>3
3<w<=5 ==> (3, 5]
Parentheses are notated for non-inclusion(3 isn't included in the solution) and brackets are notated for inclusion(5 is included in the solution).