Equation: A number decreased by 5 is equal to 10 (seperate eqaution) The sum of a number and 12 is the same as twice the number.
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In this exercise we have to use subtraction knowledge to calculate the final value of the equation, like this:
Letter C
<h2>What is subtraction?</h2>It is a mathematical operation in which it is possible to find a quantity by decreasing one number by another, it is opposed to addition, being represented by the minus sign.
So make the calculus we have:
See more about subtraction at brainly.com/question/4319655