1)
(2/6 + 3/6)*x = 3,75
5/6x = 3 3/4
x = 3 3/4 : 5/6
x = 15/4 * 6/5
x = 9/2
x = 4,5
2)
(0,6 - 0,25)*x=4,9
0,35x=4,9
x=4,9:0,35
x=14
3)
(0,875-0,2)*x=8,1
0,675x=8,1
x=8,1:0,675
x=12
4)
1 4/7x = 2 5/14
x = 2 5/14 : 1 4/7
x = 33/14 * 7/11
x = 3/2
x=1 1/2=1,5