exam Maths Puzzle Numerical Ability

one third of a three-digit number whose units digit is x, ten digit is 5 and hundreds digit is three times the units digit

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Need answer to the following problem:
f(x) = -absolute value of x; D:{-5, -3, 0, 3, 5}
solve the following equation for x: 64=2^3x.
a.x=1
b.x=2
c.x=2.5
d.x=3