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Question:

Simplify the given expression.
9(9 − 10r) + (−8 − 2r)

A 73 − 92r
Explaination

Use the distributive property to expand the expression. Then combine like terms mentally.
9(9 − 10r) + (−8 − 2r)
= 81 − 90r − 8 − 2r
= 73 − 92r