(x-12)+(16-2x)=14;
x-12+16-2x;
x-2x=14-16+12;
x*(1-2)=10;
x*(-1)=10;
x=10:(-1);
x=-10;
S={-10}
..............
(x+25)-(x-12);
x+25-x-12;
x-x=13-25-12;
0*x=-24;
S= { }
........
2x-6=14-2x ;
2x+2x=14+16;
4x=20;
x=20:4;
x=5;
S={5}
La punctul d nu stiu .....sper ca team ajutat !!