exam Maths Puzzle Numerical Ability

Here is the problem. PLEASE help if you can!

7^x-2/6=√7

√7= square root of 7

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exam Other Question

Solve the equation:

x^-2 - 15x^-1 + 44 = 0 Carol weighs 3 times as much as Sue. Both weights are whole numbers. The sum of their weights is less than 160 pounds. find the greatest possible weight in pounds for each girl.