3,3 - (х - 6,7) = 100
3,3 - х + 6,7 = 100
-х + 10 = 100
-х = 100 - 10
-х = 90
х = -90
======================
3,3 - ( - 90 - 6,7) = 100
3,3 - (-96,7) = 100
3,3 + 96,7 = 100
100 = 100
-1,3 + (х - 4,8) = - 7,1
- 1,3 + х - 4,8 = - 7,1
х - 6,1 = -7,1
х = -7,1 + 6,1
х = - 1
========================
-1,3 + (-1 - 4,8) = - 7,1
- 1,3 + (-5,8) = - 7,1
-7,1 = -7,1
4 - 5/7 - (m - 1) = 11/14
4 - 5/7 - m + 1 = 11/14
5 - 5/7 -m = 11/14
4 2/7 - m = 11/14
-m = 11/14 - 4 2/7
- m = - (4 4/14 - 11/14)
m = 3 7/14
m= 3 1/2
m = 3.5
=========================
4 - 5/7 - ( 3.5 - 1) = 11/14
3 2/7 - 2.5 = 11/14
3 2/7 - 2 1/2 = 11/14
3 4/14 - 2 7/14 = 11/14
11/14 = 11/14
1 5/6 - (y + 2/3) = 1 1/2
1 5/6 - y - 2/3 = 1 1/2
1 5/6 - y - 4/6 = 1 1/2
1 1/6 - y = 1 1/2
-y = 1 1/2 - 1 1/6
-y = 1 3/6 - 1 1/6
-y = 2/6
y = - 1/3
======================
1 5/6 - ( - 1/3 + 2/3) = 1 1/2
1 5/6 - 1/3 = 1 1/2
1 5/6 - 2/6 = 1 1/2
1 3/6 = 1 1/2
1 1/2 = 1 1/2