book Maths Puzzle Numerical Ability

3x+1=-7y
6x+7y=0

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book Other Question

The additive inverse of a number divided by 12 is the same as one less than 3 times its reciprocal. Find the number.
Thanks Please Help me with this word problem.

Six grapefruit cost as much as a dozen oranges. The cost of a dozen grapefruit and two dozen oranges is $12.00. How much does one grapefruit cost?

Thanks.