Răspuns :
a)12-(x-10)=2.4⇒12-x+10=2.4⇒-x+22=2.4⇒-x=-22+2.4⇒-x=-19.6/(-1)=x=19.6
sucees
sucees
12-(x-10)=2,4|+(x-10);
(x-10)+2,4=12|-2,4;
x-10=9,6|+10;
x=19,6;
3,(2)+x<9,(7) in N;
3,(2)+x<9,(7)|-3,(2)
x<6,(5)
x=0,1,2,3,4,5,6