4,5(7/15х+2/9)-0,77(8/11х-3/7)=-1,75

4,5(7/15х+2/9)-0,77(8/11х-3/7) = -1,75
4,5*7/15х + 4,5*2/9 - 0,77*8/11х - 0,77*3/7 = -1,75
4,5*7/15х + 1 - 0,77*8/11х -  0,33 = -1,75
4,5*7/15х - 0,77*8/11х = -1,75 +  0,33 - 1
4,5*7/15х - 0,77*8/11х = -2,42
31,5/15х - 6,16/11х = - 2,42
(31,5-6,16)/(15х-11х) = - 2,42
25,34/4x = - 2,42
4x = 25,34/ - 2,42
4х ≈ -10
х = -10/4 = 2.6 ≈ 3