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3a+5a-\left(7a-2b-2a-\left(-b\right)+3c\right)+10c
To find the opposite of 2a-b, find the opposite of each term.
3a+5a-\left(7a-2b-2a+b+3c\right)+10c
The opposite of -b is b.
3a+5a-\left(5a-2b+b+3c\right)+10c
Combine 7a and -2a to get 5a.
3a+5a-\left(5a-b+3c\right)+10c
Combine -2b and b to get -b.
3a+5a-5a-\left(-b\right)-3c+10c
To find the opposite of 5a-b+3c, find the opposite of each term.
3a+5a-5a+b-3c+10c
The opposite of -b is b.
3a+b-3c+10c
Combine 5a and -5a to get 0.
3a+b+7c
Combine -3c and 10c to get 7c.
3a+5a-\left(7a-2b-2a-\left(-b\right)+3c\right)+10c
To find the opposite of 2a-b, find the opposite of each term.
3a+5a-\left(7a-2b-2a+b+3c\right)+10c
The opposite of -b is b.
3a+5a-\left(5a-2b+b+3c\right)+10c
Combine 7a and -2a to get 5a.
3a+5a-\left(5a-b+3c\right)+10c
Combine -2b and b to get -b.
3a+5a-5a-\left(-b\right)-3c+10c
To find the opposite of 5a-b+3c, find the opposite of each term.
3a+5a-5a+b-3c+10c
The opposite of -b is b.
3a+b-3c+10c
Combine 5a and -5a to get 0.
3a+b+7c
Combine -3c and 10c to get 7c.