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-3a-\left(-4b\right)+4\left(7a-2b\right)
To find the opposite of 3a-4b, find the opposite of each term.
-3a+4b+4\left(7a-2b\right)
The opposite of -4b is 4b.
-3a+4b+28a-8b
Use the distributive property to multiply 4 by 7a-2b.
25a+4b-8b
Combine -3a and 28a to get 25a.
25a-4b
Combine 4b and -8b to get -4b.
-3a-\left(-4b\right)+4\left(7a-2b\right)
To find the opposite of 3a-4b, find the opposite of each term.
-3a+4b+4\left(7a-2b\right)
The opposite of -4b is 4b.
-3a+4b+28a-8b
Use the distributive property to multiply 4 by 7a-2b.
25a+4b-8b
Combine -3a and 28a to get 25a.
25a-4b
Combine 4b and -8b to get -4b.