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First we need to remember the rule:
Now let's rewrite the exercise in the appropriate form:
Next we will solve the exercise vertically, keeping in mind that the final result will be negative since we are subtracting a smaller number from a larger number:
Remember that the answer must be a negative number, so we will add a minus sign to get:
a is negative number.
b is negative number.
What is the sum of a+b?
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