book Maths Puzzle Numerical Ability

How would you workout the problem...log2(x-1)^2=log2^7

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I dont understand how you solve equations by using multiplication and division...Can you help me understand it? supose 5 bales of hay are weighed 2 at a time in all possible ways. the weights in pounds are 110,112,113,114,114,116,117,118,120,and 121. how much does each bale weigh?