Perform the following divisions using long division, showing all steps: a) 86 ÷ 12 b) 707 ÷ 50 c) 788 ÷ 25

12 goes into 86 seven times ($12 \times 7 = 84$).

$86 - 84 = 2$.
The remainder is 2.

The result is $\boxed{\text{7 remainder 2}}$.

50 goes into 70 one time ($50 \times 1 = 50$).

$70 - 50 = 20$.

50 goes into 207 four times ($50 \times 4 = 200$).

$207 - 200 = 7$.
The remainder is 7.

The result is $\boxed{\text{14 remainder 7}}$.

25 goes into 78 three times ($25 \times 3 = 75$).

$78 - 75 = 3$.

25 goes into 38 one time ($25 \times 1 = 25$).

$38 - 25 = 13$.
The remainder is 13.

The result is $\boxed{\text{31 remainder 13}}$.

25 goes into 72 two times ($25 \times 2 = 50$).

$72 - 50 = 22$.

25 goes into 225 nine times ($25 \times 9 = 225$).

$225 - 225 = 0$.
The remainder is 0.

The result is $\boxed{29}$.