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z-1 - 8
8 = 6,5 (z-1)
8= 6,5z - 6,5
6,5z = 14,5
z= 14,5/6,5
2x-5 - 4
3 - 5
3*4=5(2x-5)
12=10x-25
10x=37
x=3,7
10 - 8
1,5 - 9-3x
10 (9-3x) = 8*1,5
90-30x=12
30x=78
x=2,6
6,5z-6,5=8
6,5z=14,5
z= 2,23
2) 2x-5/3=4/5
10x-25=12
10x=37
x=3,7
3) 10/1,5 = 8/9-3x
90-30x=12
-30x=-78
x=2,6