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Sagot :

Bonsoir,

11+2x-12-12x -24

=  -10x -25

-2x+10-21+12x

= 10x -11

8+2y-10y +30 +4

-8y +42

-7y-12y+24 +3 +6y-14

= -13y +13

-5z +5z² -15z -42 +56z

=  5z² +36z -42

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