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Distribute the negative and rearrange terms

Theory

Distribute the negative and rearrange terms

If there's a negative in front of a difference, the expression can be rewritten by remove the parentheses, change signs, and rearrange the terms as follows. -(9x)=-9+x=x9 \text{-}(9-x)=\text{-} 9+x=x-9 All this can be done in a single step.