Răspuns:
( x - 1 ) / 4 - [ ( x - 2 ) / 4 + ( 7 - 2x ) / 5 ] = ( 5x - 5 ) / 10 - 7 / 4
( x - 1 ) / 4 - ( x - 2 ) / 4 - ( 7 - 2x ) / 5 = ( 5x - 5 ) / 10 - 7 / 4
5 × ( x - 1 ) - 5 × ( x - 2 ) - 4 × ( 7 - 2x ) = 2 × ( 5x - 5 ) - 35
5x - 5 - 5x + 10 - 28 + 8x = 10x - 10 - 35
- 23 + 8x = 10x - 45
8x - 10x = - 45 + 23
- 2x = - 22
x = 11
