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6.) 4ab + 12 a = 4a( b+ 3)
15xy² - 25 x³y = 5xy( 3y - 5x²)
7)( c+1)(2c-4d) = 2c²-4cd + 2c - 4d
( 7a - 5b) ²= 49a² = 70 ab + 25b²
(2x-4y)(2x+4y) = 4x²- 16y²