1. Add the following.
(a) 7y, -9y
(c) -2x, 2y
(e) 7xyz, -5xyz, 9xyz, -8xyz
(g) x2-a2, -5x2 + 2a2, 4x2 + 402
Add the following
(6) 3x9x
(d) 3x42,5x42, -xyz
(f) 433, -333, 973
(h) 60%, 403, 1043, -803
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