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3x-5x=-1
-2x=-1/:(-2)
x=-0,5
b) y-3=9-y
y+y=9+3
2y=12/:2
y=6
c) 1/2 z +6=z-1
1/2 z-z=-1-6
- 1/2 z=-7 /*2/1
z=14
3x = 5x +1 | -5x
-2x = 1 | :(-2)
x = - 0,5
b) y-3=9-y |+3
y=12-y |+y
2y = 12 |:2
y =6
c)1/2z + 6 = z -1 | *2
z+6=2z-1 |-6
z = 2z - 7 | -2z
-z = -7 | *(-1)
z=7