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Only like terms can be subtracted or added in algebraic expressions.
They become positive integers for instance - - 2 = 2
Multiply out all the brackets (parentheses) and then combine like terms.
It's pretty much the exact same. Subtracting is the same as adding a negative number. Foe example, five minus three is the same as five plus negative three.
No- adding negative numbers is like adding positive numbesr , except the answer is negative.