book Maths Puzzle Numerical Ability

Subject is find the equation or formula for the variable specified

ex: 8t-r=12t would i be right if I subtracted r from both sides?
I am not understanding how to find the for

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book Other Question

use rational exponents to simplify the espression below if rational exponents appear after simplifying, write the answer in radical notation.
(the 8th root of 2a)^6
sorry i cant really figure out a way to write that more clearly... How do you solve X^2+2x+1 by factoring