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7 + 3x — 12х = 3x +1.

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\begin{gathered} 7+3x-12x=3x+1 \\ 3x-12x-3x=1-7 \\ (3-12-3)x=-6 \\ -12x=-6 \\ x=(-6)/(-12) \\ x=(1)/(2) \end{gathered}

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