exam Maths Puzzle Numerical Ability

Solve for x: 9(^2x-1)= (81^(x+1)(27^-x) I think the answer is -2??????

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Beatriz is in charge of setting up a banquet hall. She has 5 tables that will seat 6 people each. if no more than 62 people will attend, how many tables seating 4 people each will she need? If one-half of the complement of an angle plus three-fourths of the supplement of the angel equals 110 degrees, find the measure of the angel.