1. Subtract by horizantal method: (a) 3m? + ón from 3m2 + 8n (b) -3x2 + 6x + 3 from 5x2 - 9 (C) 3x - 4z from 9x + 8y + 9z (d) a+b - c from--b-C (e) x2 - y2x + z from y2x - x - Z
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