1357
1)
2*(2-у) = у - 5
4 - 2у = у -5
3у = 9
у = 3
2)
-4(х-2) = -6
-4х +2 = -6
-4х = -8
х =2
3)
-(3х-4) = 3х -8
6х = 4+8 = 12
х = 2
4)
3(х-5) = х+3
3х - 15 =х +3
2х = 15+3 = 18
х = 9
1358
1)
0,8х-3,5 = -1,2х+0,5
2х = 4
х = 2
2)
1.3*(t-0.6) = 1.8t
1.3t - 0.78 = 1.8t
0.5t = 0.78
t =1.56
3)
1.2(x-5) = 0.2x+0.6
1.2x -0.6 = 0.2x+ 0.6
x = 1.2
4)
7.2 - (6.2 - x) = 2.2
1 + x = 2.2
x = 1.2