Solve the following expression:
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Solve the following expression:
Note the following law:
Now let's write the exercise in the appropriate form:
We'll move minus 2 to the right side and maintain the appropriate sign:
Now we get:
a is negative number.
b is negative number.
What is the sum of a+b?
Think of it as "the opposite of the opposite". If -4 is negative, then the opposite of -4 is positive 4. It's like saying "not not happy" means happy!
Always handle double negatives first! Don't work left to right with operations until you've simplified to . Order of operations comes after simplifying signs.
When moving a term across the equals sign, change its sign. So becomes because +2 becomes -2.
Take it step by step! First handle double negatives, then combine like terms on each side, finally isolate the unknown. Write each step clearly to avoid sign errors.
The key is: subtracting always changes the sign of what you're subtracting!
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