( -12x^4+8-3x )+( 13x^3+14x-9x^4 )
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(-12x^4+8-3x)+(13x^3+14x-9x^4)
(-48×+8-3x)+(39x+14x-36x)
-51x+8+39x+14x-36x
-87x+53x+8
-34x+8
34x-8x=34/8
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