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-4x²+3
d) 10x²-8x+5+2x²+9x-10
12x²+x-5
f)3x²-8x+5+2x²+9x-10
5x²+x-5
h)3x²+3x+3+5x²-2x-3
8x²+x
j) 10x²+8x-7+2x²-6x+9
12x²+2x+2
Espero haberte ayudado.