This is the third time that you have posted this question
I answered it
http://www.jiskha.com/display.cgi?id=1268098731
and it was also answered by "nancy"
Don't you ever read your own posts ?
Can anyone explain this in 50 words why the equation turns out like it does?
-6x-18=-6x+5 0x=23 and can not have zero in the denominator. Division by zero is undefined.
15x+18=15x+18 0x=0 Well, if you take anything times zero the resulting product is zero.
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