exam Maths Puzzle Numerical Ability

Write (81^(x+1)(1/9^(4-x) / 27(243^(x-2) as a single power.

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exam Other Question

Hi could you help me solve this rational equation?

Solve each equation. Check each solution.

-x/4=2x/3

Thank you
a =y
a+4 Make 'a' the subject