SOLUTION: How do I find a common denominator and simplify for 2/15x - 4/21x^2? The answer says it's 2(7x-10)/105x^2

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Question 535931: How do I find a common denominator and simplify for 2/15x - 4/21x^2?
The answer says it's 2(7x-10)/105x^2
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
3*5=15
3*7=21
3*5*7=105
multiply 2/15x by 7x/7x
14x/105x^2
multiply -4/21x^2 by 5
-20/105x^2
(14x-20)/105x^2
factor out 2 in the numerator
2*(7x-10)/105x^2