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3b-20a
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3b-20a
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a-3\left(7a+5b\right)+18b
The opposite of -5b is 5b.
a-21a-15b+18b
Use the distributive property to multiply -3 by 7a+5b.
-20a-15b+18b
Combine a and -21a to get -20a.
-20a+3b
Combine -15b and 18b to get 3b.
a-3\left(7a+5b\right)+18b
The opposite of -5b is 5b.
a-21a-15b+18b
Use the distributive property to multiply -3 by 7a+5b.
-20a-15b+18b
Combine a and -21a to get -20a.
-20a+3b
Combine -15b and 18b to get 3b.
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