[tex]12x - 1 - 3x= 3x - 10 - 3x[/tex]
[tex]9x - 1 = - 10[/tex]
[tex]9x - 1 + 1 = - 10 + 1[/tex]
[tex]9x = - 9[/tex]
[tex] \frac{9x}{9} = \frac{ - 9}{9} [/tex]
[tex]x = - 1[/tex]
[tex]3( - 1) - 10 = 12( - 1) - 1[/tex]
[tex] - 3 - 10 = - 12 - 1[/tex]
[tex] - 13 = - 13[/tex]
[tex]13 = 13[/tex]
[tex]1 = 1[/tex]
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[tex]12x - 1 - 3x= 3x - 10 - 3x[/tex]
[tex]9x - 1 = - 10[/tex]
[tex]9x - 1 + 1 = - 10 + 1[/tex]
[tex]9x = - 9[/tex]
[tex] \frac{9x}{9} = \frac{ - 9}{9} [/tex]
[tex]x = - 1[/tex]
[tex]3( - 1) - 10 = 12( - 1) - 1[/tex]
[tex] - 3 - 10 = - 12 - 1[/tex]
[tex] - 13 = - 13[/tex]
[tex]13 = 13[/tex]
[tex]1 = 1[/tex]