What is the answer to 10 - (8p+3) = 9 (2p-5) ?

Use distribution.

10 - (8p + 3) = 10 - 8p - 3 = 7 - 8p

9 (2p - 5) = 18p - 45

So ...

-8p + 7 = 18p - 45

Subtract 7 from both sides

-8p = 18p - 52

Subtract 18p from both sides

-26p = 52

Divide both sides by - 26.

p = - 2

There's your answer : D