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10x - 25 = 12
10x = 37
x = 3,7
b)10/1,5=8/9-3x
c)2/x=3/x-1
d)4/x+1=5/x
30x-25=12
30x=37 /:30
x=37/30=1 7/30
b)10/1,5=8/9-3x
10*2/3=8/9-3x
20/3=8/9-3x /*9
60=8-27x
52=-27x /:(-27)
x=-52/27 =-1 25/27
c)2/x=3/x-1 /*x
2=3-x
x=1
d)4/x+1=5/x /*x
4+x=5
x=1