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6x + 3 -x
5x + 3
b) x2 - 1 - (x2-2x+1)
x2 - 1 -x2 +2x -1
2x-2
2(x-1)
c) x2 +8x +12 -(x2 + 7x +10)
x2 + 8x +12- x2 -7x -10
x +2