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I need to combine like terms. Here are a few questions that I am having trouble with.

-r - 10r

n-4-9

-4+7(1-3m)

-r - 10r = -11r

n-4-9 = n - 13

-4+7(1-3m) = -4 + 7 - 21m = 3 - 21m

-r-10r=-11r (because -1-10=-11)
n-4-9=n-13 (-4-9=-13)
-4+7(1-3m)=-4+7-21m=3-21m

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