aThere are no solutions because no value can be used for the variable x for the equation to remain true. 

b

 

There is one solution because only one value can be used for the variable x for the equation to remain true.

 

 

 

c

 

There are 2 solutions because only 2 values can be used for the variables for the equation to remain true.

 

 

 

d    
There are an infinite number of solutions because any value can be used for the variable x and the equation would remain true.

 

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1 Answer

Answer d, infinite number of solutions
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