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[tex]3 \times ( - x) + 51 = 6 - 12[/tex]
[tex] - 3x - 21 = 81 - 84[/tex]
[tex]3 \times ( - x) + 51 = 6 - 12[/tex]
[tex] - 3x - 21 = 81 - 84[/tex]
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3(-х)+51=6-12 -3х-21=81-84-3х+51=-6 -3х=-3+21
-3х=-6-51 -3х=18
-3х=-57 х=18:(-3)
х=-57:(-3) х=-6
х=19