exam Maths Puzzle Numerical Ability

Find the absolute value. -|-6.8

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Need help,
5^2x=5^(x^2-12) The parenthesis means the exponent of 5.
For the first step I have 2xln5=(x^2-12)ln5 but now I'm not sure how to finish the problem. grapg the functions y = x and y = square root of x on the same grapg by plotting points if necessary. show the points of intersection of these two graphs.