SOLUTION: Which of the following does not have all real numbers as solutions? a)5x= 4x+x b)2(x+6)=2x+12 c)1/2x=0.5x d)3/x-2= 3/x-2 e)9+6a=3(2a+3) When a problem has all rea

Question 1045285: Which of the following does not have all real numbers as solutions?
a)5x= 4x+x
b)2(x+6)=2x+12
c)1/2x=0.5x
d)3/x-2= 3/x-2
e)9+6a=3(2a+3)
When a problem has all real numbers as a solution, it means that both sides are equal. But in all of these equations, both sides are equal. So how can any one of them not have all real numbers as a solution?

Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
You are saying that these equations are identities. This means they are true for all values of the variable.

Try to solve each of them to find which if any has no solution. Any expression undefined? ANY EXPRESSION UNDEFINED?
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