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-a-\left(-b\right)-3-\left(-4+2b-2a\right)
To find the opposite of a-b+3, find the opposite of each term.
-a+b-3-\left(-4+2b-2a\right)
The opposite of -b is b.
-a+b-3-\left(-4\right)-2b-\left(-2a\right)
To find the opposite of -4+2b-2a, find the opposite of each term.
-a+b-3+4-2b-\left(-2a\right)
The opposite of -4 is 4.
-a+b-3+4-2b+2a
The opposite of -2a is 2a.
-a+b+1-2b+2a
Add -3 and 4 to get 1.
-a-b+1+2a
Combine b and -2b to get -b.
a-b+1
Combine -a and 2a to get a.
-a-\left(-b\right)-3-\left(-4+2b-2a\right)
To find the opposite of a-b+3, find the opposite of each term.
-a+b-3-\left(-4+2b-2a\right)
The opposite of -b is b.
-a+b-3-\left(-4\right)-2b-\left(-2a\right)
To find the opposite of -4+2b-2a, find the opposite of each term.
-a+b-3+4-2b-\left(-2a\right)
The opposite of -4 is 4.
-a+b-3+4-2b+2a
The opposite of -2a is 2a.
-a+b+1-2b+2a
Add -3 and 4 to get 1.
-a-b+1+2a
Combine b and -2b to get -b.
a-b+1
Combine -a and 2a to get a.