Écrire le plus simplement possible ( réduire les expression)
1) 3x² +5x+5+3x²+12+2x
2) 5x²+3x+4+8x+7x²+6
3) 5x²+6x-4-3x²+20
4) -7y+4y² +9-5y² +12y-11
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