3/4(1/6х - 1/3) = 2х - 11 1/2
1/8х - 1/4 = 2х - 11 1/2
0,125х - 0,25 = 2х - 11,5
0,125х - 2х = - 11,5 + 0,25
- 1,875х = - 11,25
х = 11,25 : 1,875
х = 6
Пояснения:
3/4 * 1/6 = 3/24 = 1/8
3/4 * 1/3 = 3/12 = 1/4
1/8 = (1*125)/(8*125) = 125/1000 = 0,125
1/4 = (1*25)/(4*25) = 25/100 = 0,25
1/2 = 5/10 = 0,5
(-) : (-) = (+)