exam Maths Puzzle Numerical Ability

how do you solve problem #43 on pae 469

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exam Other Question

log(base6)(b^2 + 2) + log(base6)2 = 2

and

log(base3)(5x+5) - log(base3)(x2 - 1) = 0

Thank You!
Solve for "d" : ax+df=r(d+e)