11. How much is 2x + 3y - 8z greater than -2x + 7y + 9z?
12. What must be subtracted from ab + 6a²62 – 7ab + 4 to g
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11) 2x+3y-8z-( -2x +7y+9z)
4x-4y-17 z
4x-4y-17 z
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