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2x +5 -x +3
2x -x +5 +3
x +8
2. (x² +4x -1) -(2x² +4x)
x² +4x -1 -2x² -4x
x² -2x² +4x -4x -1
-x² -1
3. (y² -3) - (4y² +5y +6)
y² -3 -4y² -5y -6
y² -4y² -5y -3 -6
-3y² -5y -9
4. (5a -6 +ab) -(a +2ab -1)
5a -6 +ab -a -2ab +1
5a -a +ab -2ab -6 +1
4a -ab -5