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30-8b-7a
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30-8b-7a
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9b-2a-\left(-7\right)-5a-17b+23
To find the opposite of 2a-7, find the opposite of each term.
9b-2a+7-5a-17b+23
The opposite of -7 is 7.
9b-7a+7-17b+23
Combine -2a and -5a to get -7a.
-8b-7a+7+23
Combine 9b and -17b to get -8b.
-8b-7a+30
Add 7 and 23 to get 30.
9b-2a-\left(-7\right)-5a-17b+23
To find the opposite of 2a-7, find the opposite of each term.
9b-2a+7-5a-17b+23
The opposite of -7 is 7.
9b-7a+7-17b+23
Combine -2a and -5a to get -7a.
-8b-7a+7+23
Combine 9b and -17b to get -8b.
-8b-7a+30
Add 7 and 23 to get 30.
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