exam Maths Puzzle Numerical Ability

please help me solve this question (-67=6x-1)

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exam Other Question

How many sides does a polygon with an interior angle measure of 120 degrees have? How would you multiply this binomial?

(4c-1)^2

I came up with 16c^2-8c+1... is that correct... or is it 16c^2+8c+1?