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(-3x² + 6x - 12) + (5x + 9) is equivalent to expression
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(-3x² + 6x - 12) + (5x + 9) is equivalent to expression

User Fuzz Evans
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\begin{gathered} \mleft(-3x^2+6x-12\mright)+(5x+9) \\ =-3x^(2)+6x-12+5x+9 \\ =-3x^(2)+11x-3 \end{gathered}

User Nicolas Merouze
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