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A+B= -7x+5+2x-3= -5x+2
2) 1/x-x = x-1/x
3) 6a-2b+a-4b-5= 7a-6b-5
4) 4x(-3x+2y)= -12x²+8xy
5) (2a-b)(2a+b)= 4a²+2ab-2ab-b²= 4a²-b²
semoga benar dan bermanfaat