exam Maths Puzzle Numerical Ability

I asked this question a few days ago and I am waiting for an answer. I hope I will get one today.
Suppose that you save for retirement by contributing the same amount each month

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6. explain how the formula for the area of a triangle can be determined by using the formula for the area of a pallallogram. the problem is log8(11-6x)=log8(1-x) the book says no solution but I keep coming up with positive 2.
log8 on each side of the equation divides out equally on both sides which leav