(x²+5) + (x²-4) = x²+x²+5-4 = 2x²+1
(y-2x) + (4x+6) = y+4x-2x+6 = y+2x+6
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1)
(x²+5) + (x²-4) = x²+x²+5-4 = 2x²+1
2)
(y-2x) + (4x+6) = y+4x-2x+6 = y+2x+6