book Maths Puzzle Numerical Ability

How would you solve the following problems:

3(-2-3x)=-9x-4
5/2t-t=3/2t+3

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book Other Question

classify the given numbers as real and rational, real and irrational, or complex

(80)^1/5 Use sigma notation to write the series 81 - 54 + 36 - 24 +.... show the steps to solve.