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8k-5
x - 10
It is: 5k-60
9b2-7
It is simply: x-1
(4n) - 25
You write it as5nNothing more, nothing less.
8<19z
35-(4x)
It is: 155c-47
8k-5
m - 12
M < 90
It is: y-4
As an algebraic expression it is: 2x-9
x - 10
3x - 3