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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A number or expression can be written as a sum of two or more terms. For example, the number $6$ can be written as $3+3$ or $1+2+3,$ and $10x$ can be written as $4x+6x.$ The variations are infinite but the aim is usually to make a simplification easier, e.g. factoring.