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3x=2*18
3x=36
x=36/3
x=12
b) 6/k=2/5
2k=5*6
k=30/2
k=15
c) 5/3a=10/21
30a=5*21
a=105/30
a=3,5
d) 7/2b=35/4
70b=4*7
b=28/70
b=0,4
e) 4/9=36/m
4m=9*36
m=324/4
m=81
f) 9/10=6/5c
45c=10*6
c=60/45
c=4/3