3 * ( 2 1/2 х -0,2) -15 1/15 = 6- (2/3-0,5х)
(3/1 * 5/2 )*х - 3*0,2 - 15 1/15 = 6 - 2/3 +0,5х
7,5х - 0,6 - 15 1/15 = 5 1/3 +0,5х
7,5х -0,5х = 5 1/3 +0,6 + 15 1/15
7х= 5 1/3 + 15 1/15 + 3/5
7х= 5 5/15 + 15 1/15 +9/15
7х = 21
х=21/7
х=3
3 * (2 1/2 *3 - 0,2) - 15 1/15 = 6- (2/3 -0,5 *3 )
3 * (7,5- 0,2) - 15 1/15 = 6- (2/3 - 1,5)
3* 7,3 - 15 1/15 = 6 - (2/3 - 1 1/2)
21,9 - 15 1/15 = 6 - ( 4/6 - 1 3/6)
21 27/30 - 15 2/30 = 6 - (- 5/6)
6 25/30= 6 + 5/6
6 5/6 = 6 5/6