Answer:
You can't find y in this way
Step-by-step explanation:
You should know the value of x
But you can say
Y=7x
Answer:

Step-by-step explanation:
Let the number be x
Given

Required
Find x

Collect Like Terms

Take LCM


Multiply both sides by 6


Divide both sides by -3


Hence, the number is 
Assuming what is meant by "infinite solutions" are infinite number of solutions of a logarithmic equation.

and

Answer:
the second one i think
Step-by-step explanation: