- 7 * 3 + 7 * 2 * x = - 6 * x - 1 ;
- 21 + 14 * x = - 6 * x - 1
14 * x + 6 * x = - 1 + 21 ;
x * ( 14 + 6 ) = 21 - 1
20 * x = 20
x = 20 / 20
x = 1
- 7 * 3 + 7 * 2 * x = - 6 * x - 1 ;
- 21 + 14 * x = - 6 * x - 1
14 * x + 6 * x = - 1 + 21 ;
x * ( 14 + 6 ) = 21 - 1
20 * x = 20
x = 20 / 20
x = 1