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The focus is on Combining Like Terms. Students get introduced to this in 6th and 7th grade. And in 8th grade positive and negative numbers are used for the constants and variables. These problems sets are written with 8th grade students in mind. Having a clear understanding of how to combine positives and negatives is essential prior to solving multistep equations introduced in 8th grade. The vertical number line is included for students struggling with positive and negative numbers. Think of positive numbers as going up and negative numbers as going down.