Answer:7 . 4 + 6 - 12 : 4 = 31Step-by-step explanation:* To solve this problem lets revise the order of operations in mathematics- The operations are:# Addition# Subtraction# Multiplication# Division# Exponentiation# Grouping ⇒ Parenthesis or brackets- The order of these operations is:# Parenthesis# Exponents# Multiplication and Division which comes first from left to right# Addition and Subtraction which comes first from left to right- There is a word made from the first letter of each operation PEMDAS to remember the order of operations* Lets solve the problem∵ 7 . 4 + 6 - 12 : 4∵ The (.) means multiply the numbers∵ The symbol (:) means divided the numbers∴ At first multiply 7 by 4 and divide 12 by 4∴ (7 × 4) + 6 - (12 ÷ 4)∴ 28 + 6 - 3∵ Addition comes before subtraction from the left∴ (28 + 6) - 3∴ 34 - 3 = 31∴ 7 . 4 + 6 - 12 : 4 = 31