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3y²-y²+5y+2y-6y-10=0
2y²+y-10=0
(2y+5) (y-2)
2y+5=-5/2 & y=2
3y² - y - 10 = y² - 2y
2y² + y - 10 = 0
( 2y + 5 ) ( y - 2 ) = 0
y = -5/2 atau y = 2