(2y²+4y²+3) + (15y⁴+10y³-3y²)
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Step-by-step explanation:
= (2y²+4y²+3) + (15y⁴+10y³-3y²)
= 2y²+4y²+3+15y⁴+10y³-3y²
= 15y⁴+10y³+3y²+3
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