bonjour aider moi ci vous plait réduire les expressions si possible 12-2x= ;6x+x+5y= ; 8x+3y-y-4+10x= ;x+3+x+3= ;7y-6x+5+3= ; 5x2+1+3x+14+2x2+1= ;9x2+xy+17+4y2+5xy-8x2-11 = merciiiiiii
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