bjr
ex 1
6x * 5y = 30xy
-3u + u + 9v - 5v = -2u + 4v
3a - a - 2b + c - 2a - c = -2b
3c + 14tb
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bjr
ex 1
6x * 5y = 30xy
-3u + u + 9v - 5v = -2u + 4v
3a - a - 2b + c - 2a - c = -2b
3c + 14tb