Bonsoir,
K=
6x-18 -3 +5x=
11x -21
L=
5-2y +3y -7=
y -2
M=
24 +4z + 2z -z² -6 +3z=
-z² +9z +18
N=
6t² +4t -15t -10 -t² -6=
5t² -11t -16
