1) x + (7 + x ) = 11;
x + 7 + x = 11;
x + x = 11 - 7;
2x = 4;
x = 2;
2) x + (4 + х) + х = 16;
x + 4 + x + x = 16;
x + x + x = 16 - 4 ;
3x = 12;
x = 4.
1) x + (7 + x ) = 11;
x + 7 + x = 11;
x + x = 11 - 7;
2x = 4;
x = 2;
2) x + (4 + х) + х = 16;
x + 4 + x + x = 16;
x + x + x = 16 - 4 ;
3x = 12;
x = 4.