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3ax-ax=2b
2ax=2b /:2a
x=b/a, a≠0
b)
bx-ax=a-b
(b-a)x=-(b-a) /:(b-a)
x=-1, b≠a
c)
2mx-4x=9-3m
(2m-4)x=9-3m /:(2m-4)
x=(9-3m)/2m-4), m≠2
d)
3ax-cx=-b
(3a-c)x=-b
x=b/(c-3a) c≠3a