(3 y 2 + 5y - 4 ) - ( -5y2 + 15 y - 4 )
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= (3y²+5y-4) -(-5y²+15y-4)
= 3y²+5y-4 + 5y²-15y+4
= 3y²+5y²+5y-15y-4+4 = 0
=8y²-10y = 0
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