Step One: From the right to left, start with odd position, assign the odd/even position to each digit.
Step Two: Sum all digits in odd position and multiply the result by 3. (0+7+2+5+7+0)*3=63
Step Three: Sum all digits in even position. (1+1+4+2+6+8)=22
Step Four: Sum the results of step three and four: 63+22=85
Step Five: Divide the result of step four by 10. The check digit is the number which adds the remainder to 10. In our case, divide 85 by 10 we get the remainder 5. The check digit then is the result of 10-5=5.