exam Maths Puzzle Numerical Ability

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?

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exam Other Question

For the following set, which number has the largest absolute value?
4, -1, 12, -20, 19, 0
Please show me how to solve the equation and check the answer. Thanks!

0.05(z+20)=0.1z-0.5