exam Maths Puzzle Numerical Ability

Given that (3x-a)(x-2)(x-7)=3x cubed-32x squared+87x-70, determine the value of a.

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exam Other Question

The second of three numbers is 1 less than the first. The third number is 5 less than the second. If the first number is twice as large as the third, Find the three numbers. please show me the answer and the solution for this equation:

a/6a-9b - b/4a-6b