exam Maths Puzzle Numerical Ability

Please show me how to solve the equation and check the answer. Thanks!

0.05(z+20)=0.1z-0.5

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exam Other Question

Hey, I was wondering you you solve radical equations such as this.
3 to the square root of 2x+3 = the square root of x-7

And also, what is a exponential decay? What is the domain of g(x)= (2x+1)/(x-3) ?