13d24-12d24

Factor 12 out of 12d.

13d24-12(d)24

Cancel the common factors.

Factor 12 out of 24.

13d24-12d12⋅2

Cancel the common factor.

13d24-12d12⋅2

Rewrite the expression.

13d24-d2

13d24-d2

13d24-d2

To write -d2 as a fraction with a common denominator, multiply by 1212.

13d24-d2⋅1212

Multiply d2 and 1212.

13d24-d⋅122⋅12

Multiply 2 by 12.

13d24-d⋅1224

13d24-d⋅1224

Combine the numerators over the common denominator.

13d-d⋅1224

Factor d out of 13d-d⋅12.

Factor d out of 13d.

d⋅13-d⋅1224

Factor d out of -d⋅12.

d⋅13+d(-1⋅12)24

Factor d out of d⋅13+d(-1⋅12).

d⋅(13-1⋅12)24

Multiply d by 13-1⋅12.

d(13-1⋅12)24

d(13-1⋅12)24

Multiply -1 by 12.

d(13-12)24

Subtract 12 from 13.

d⋅124

d⋅124

Factor (13d)/24-(12d)/24