book Maths Puzzle Numerical Ability

can you show me how to work problem 8b-4=5b+8

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I do not understand how to solve this inequality:
(3t-4)/3>or = (2t+4)/6+(5t-1)/9

Thank you.
Simplify the following expression as much as possible:

t^2 square root of 8tx^2 -(minus) x square root of 18t^5