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= 7a²-9-8a²-14
= -a²-23
2. 9x+15y-9+(9x+15y-10)
= 18x+30y-19
3. a. A+B
= 3x+5y+(4x-2y)
= 7x+3y
b. A-B
= 3x+5y-(4x-2y)
= 3x+5y-4x+2y
= -x+7y