book Maths Puzzle Numerical Ability

In A.D. 1054, Chinese astronomers observed the light from a supernova in the night sky. This supernova was the incredibly powerful origin of what is now the Crab Nebula.
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solve for r:1/8(r+3)=6.
If you can help to solve it also as subtraction.
Thank you, it will a big help Simplify: -3√[121]+(-1)^3