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Sum
Expand.
`(m+2/3)(m-7/3)`
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Solution
`(m+2/3)(m-7/3)`
= `(m)^2 + {2/3 + (-7/3)}m + (2/3) × (-7/3)`
= `(m)^2 + (2/3 - 7/3)m - 14/9`
= `(m)^2 - (5m)/3 - 14/9`
Concept: Expansion of (x + a)(x + b)
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