book Maths Puzzle Numerical Ability

(1+b-2b^-1)/(6b^-2+b^-1-1)

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PLEASE HELP ME!
Apply distributive property, simplify combining like terms.
2 ( 3a - 5 ) + 2a = ??

My answer that i got was a x 2 but i think its wrong PLEASE HELP! log(10x/y)=1+log x-log y. I have no idea whether this problem is true or false. Could you please help show me the steps in finding the answer?