exam Maths Puzzle Numerical Ability

what is the algebra statement for Three times the sum of a number and seven yields the same result as the twice the same number decreased by four.

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exam Other Question

Adult tickets for a play cost $10 and child tickets cost $4. If there were 30 people at a performance and the theater collected $234 from ticket sales, how many adults and how many children attended the play? For what values of 'a' is the opposite of 'a' greater than 'a'? less than 'a'? equal to 'a'?