exam Maths Puzzle Numerical Ability

log7X

The exercise asks, write the espression using only natural logarithms. The other problems I worked X was given a value. What is X in this problem.

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exam Other Question

Prove that for any sets A and B, if A is a subset of B, then

Help! Thanks!
PLease help to solve :

3x - 2 / 7 - x/4 - x-3/2 = 1