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-20v + 4v2 - 5y + vy = 4v2 - 20v + vy - 5y
= 4v*(v - 5) + y*(v - 5) = (4v + y)*(v - 5)
2y^2+5y+2=(2y+1)(y+2)
5(6 + y)
(x + 5y)(x + 7y)
(4y - 1)(5y + 2)
5y + 5y = 10y
(y+2)(y+3)
(2x + 3y)(2x + 5y)
2(5x + 3y)(2x + 5y)
(x + 5y)(x - 3y)
(y - 1)(y - 4)
x2 + 8xy + 15y2 = (x + 3y) (x + 5y)
(8x + 5y)(64x^2 - 40xy + 25y^2)