exam Maths Puzzle Numerical Ability

Find all the errors in the following solution to an equation:
7/x = 8/x+3 +1

7(x+3) = 8x + 1
7x + 3 = 8x
-x = -3
x= 3

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exam Other Question

Suppose that one solution is 50% alcohol and another solution is 80% alcohol. HOw many liters of each solution should be mixed to make 10.5 liters of a 70% alcohol solution? Can you help me write in exponential form:
(6 suare root of x)^5