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2. 14b-15i-45j+64k
2. 14b+15i-30i-45j+13k+51k = 14b-15i-45j+64k
6. (10x2y) - (10x10) = 20y - 100
7. x^2 - 7x + 10x - 35 = x^2 + 3x - 35