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1/z-1=6,5/8
8=6,5z-6,5
-6,5z=-6,5-8
-6,5z=-14,4
z=2³/₁₃
e)
2x-5/3=4/5
10x-25=12
10x=12+25
10x=37
x=3,7
f)
10/1,5=8/9-3x
90-30x=12
-30x=12-90
-30x=-78
x=2,6