Aslide on the playground is 12 1/2 feet long. it is 3 feet 7 inches longer than the small slide. how long is the small slide ?

We know that
1 ft is equal to 12 in
12 1/2 ft> (12*2+1)/2> 25/2 ft
3 ft 7 in
7 in> 7/12 ft
so
3 ft 7in> 3 (7/12) ft> (3*12+7)/12> 43/12 ft

the small slide=(25/2)-(43/12)
multiply (25/2) by 6/6> 150/12
so
the small slide=(25/2)-(43/12)> 150/12-43/12> 107/12 ft

the answer is
the small slide is 107/12 ft long

There should only be 1 solution