Peter says, "If you subtract 17 from my number and multiply the difference by −3, the result is −45." What is Peter's number?

32

Step-by-step explanation:

Let Peter's number = p

(Peter's number - 17) * - 3 = - 45

(p - 17) * - 3 = - 45

Open the bracket

-3p + 51 = - 45

-3p = - 45 - 51

-3p = - 96

Divide both sides by -3

-3p/ -3 = - 96/ - 3

p = 32

Hence, Peter's number is 32

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