exam Maths Puzzle Numerical Ability

how can u do this equation 0.7n-1.5+7.3n=14.5

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exam Other Question

Hello the section im working on is on solving rational equations. I dont understand this one im working on.
Here it is

x/x-1 + x = 4x-3/x-1

Thanks for the help my problem is I need to find the domain and range for f(x)=The Square Root of
25-(X^2)....all terms are under the square root symbol. ALSO where can I see if its increasing or decreasing?