1) 80-(35,6+x) = 11,5,
80-35,6-x= 11,5,
44,4 -x =11,5,
-x = 11,5 - 44,4,
-x = -32,9,
x = 32,9.
2) (62,4 +y) -13,4 = 91,
62,4 +y -13,4 = 91,
y + 49 = 91,
y = 91-49,
y =42e.
3) 9,15 +( x -8,5) = 21,77,
9,15 + x -8,5 = 21,77,
0,65 +x = 21,77,
x = 21,77 - 0,65,
x= 21,12 .
4) 0,175 -( 0,03 - x) = 0,15,
0,175 - 0,03 + x = 0,15,
x + 0,172 = 0,15,
x = 0,15 - 0,172,
x = - 0,022.
5) (50-x )+7,16 = 8,132,
50-x +7,16 = 8,132,
-x + 57,16 = 8,132,
- x = 8,132-57,16,
-x = - 49,028,
x = 49,028.
6) 100,3- (9,2 - x)= 97,64,
100,3- 9,2 + x= 97,64,
x + 91,1 = 97,64,
x = 97,64 - 91,1,
x = 6,54.