To solve the equation we proceed as follows:
log5(10x-1)=log5(9x+7)
canceling out log5 we get:
(10x-1)=(9x+7)
solving for x we get:
10x-9x=7+1
x=8
thus the value of x=8
Because .4 is bigger than .3.
the closer you are to .9 the more closer you are to a positive 1
hope this helps :)
The set that is closed under subtraction is rational numbers