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— 3y +3y + у — 7y = identity and combine liked terms

User TabbyCool
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To comibine liked terms we find the ones that have the same literal part and add the coefficients together


\begin{gathered} -3y+3y+y-7y \\ (-3+3+1-7)y \\ -6y \end{gathered}

this can also be seen as taking a common factor y and adding all the other terms together

User Arjit
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