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1 + 6m - 3m - 18m²
1 (1 + 6m) - 3m( 1 + 6m)
(1 + 6m)(1 - 3m)
2.) 15- 7x - 2x^ 2
15 + 3x - 10x- 2x²
3(5 + x) - 2 x( 5 + x)
(5 + x) ( 3 - 2x)