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x + 2 + x - 9
x + x + 2 - 9
2x - 7
b. (3x - 3) - (7x - 1)
3x - 3 - 7x + 1
3x - 7x - 3 + 1
-4x - 2
b. (3x-3)-(7x-1)
=3x-7x-3-1
=-4x-4