[tex]12x+9= 3x+63 \\ 12x-3x=63-9 \\ 9x=54 \ \ \ /:9 \\ x=6 \\ \\ \\ 7x-6=3x+2 \\ 7x-3x=2+6 \\ 4x=8 \ \ \ \ /:4 \\x=2[/tex]
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[tex]12x+9= 3x+63 \\ 12x-3x=63-9 \\ 9x=54 \ \ \ /:9 \\ x=6 \\ \\ \\ 7x-6=3x+2 \\ 7x-3x=2+6 \\ 4x=8 \ \ \ \ /:4 \\x=2[/tex]