exam Maths Puzzle Numerical Ability

2x - 3y = 12

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exam Other Question

I need to subtract two rational expressions, and the problem is
((3a+2b)/(3b)) - ((a+2b)/(6a))
I do not understand how to find the lowest common denominator, and what to do after I do find it.
find the value of the expression
log 1/625
5