Simplifying Algebraic Expressions - changing +/-

label Algebra
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Hi! I really need to understand when, why, and where in the problem do you change a negative into a positive or a positive into a negative in simplified algebraic expressions please?

Thank you! 

May 20th, 2015

when a negative number is multiplied or divided by a positive number the result is a negative number. And when a bigger negative number is added or subtracted from a smaller negative or positive number negative.

May 20th, 2015

Thank you!

May 20th, 2015

Thank you!

May 20th, 2015

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