book Maths Puzzle Numerical Ability

I'm trying to solve the following equation but keep getting confused. Any help would be appreciated!!!

(-3j - (-4)) / -6 =12

Thanks!

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book Other Question

If prices go down by 20% by what % does your purchasing power increase? (Purchasing power means the amount of goods you can purchase on a fixed amount of money.) (x-6)(9x+4)(9x-4)