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3х-7-(-2х) +9 simplify
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3х-7-(-2х) +9 simplify

User Muzzamil
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3x-7-(-2x)+9
\begin{gathered} 3x-7+2x+9 \\ (3+2)x+(-7+9) \\ 5x+2 \end{gathered}

User Greg Bell
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