exam Maths Puzzle Numerical Ability

Solve for x: {(3^x9^x+20)/(27^2x+5)}=81^x+5

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exam Other Question

Perform the indicated operations

(2x^6 - 8x^3)(8x^6 + 3x^3 - 8)
(4x^5 + 7x^4 - 3x^2 + 9) + (6x^5 -8x^4 + 2x^3 - 7)