Question 178791
5a
--- 
5a+5 

times

10a+10
-------
a

could you help me simplify this equation and then show me the restrictions? 
thank you!
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I think you mean
{{{(5a/(5a+5))*((10a+10)/a)}}}
That's not an equation.  All equations have an equal sign.
It can be simplified.
{{{(5a/(5a+5))*((10a+10)/a)}}}
={{{(a/(a+1))*(10*(a+1)/a)}}}
The a's cancel, and the (a+1)'s cancel.
= 10