book Maths Puzzle Numerical Ability

3(x+2)+7=12

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How do i start this problem? m-(3/8)> (1/2) I need help with four problems: I need to write a variable expression for each word phrase:
Problem 1: five less than y
Problem 2:the product of a number and 78
Problem 3:the quotient of a number and 9
Problem 4:ten increased by a number