(-3d+4)–(6d–9)
(add and subtract linear expressions)

−9d+13

Step-by-step explanation:

3d+4−(6d−9)

Distribute the Negative Sign:

=−3d+4+−1(6d−9)

=−3d+4+−1(6d)+(−1)(−9)

=−3d+4+−6d+9

Combine Like Terms:

=−3d+4+−6d+9

=(−3d+−6d)+(4+9)

=−9d+13

=−9d+13

60: 45 =12: 9 =4: 3 so the answer is 4: 3