exam Maths Puzzle Numerical Ability

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The additive inverse of a number divided by 12 is the same as one less than 3 times its reciprocal. Find the number.

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exam Other Question

Solve the linear equations:

A + B + C = 0
4A - 10B = 3
-10B + 5C = 6
1. Solve the equation: logbase4(x-5) = 0.5 - logbase4(1-x).

i follow through with the problem and get four different answers but none of them check out when they are plugged into "X".