book Maths Puzzle Numerical Ability

What is the answer to 5t+8=88

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book Other Question

No matter how I try, I am not understanding this type of problem....
3x -2y + 5z
____________
2y -3x -5z

This is how I try....
3x (3x-2y + 5z) -(2y + 5z)
_________ -0.3054 * 10 to the power of 1 = ?