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[tex]\\ \sf\longmapsto 3x-4=x-8[/tex]
[tex]\\ \sf\longmapsto 3x-x=8+4[/tex]
[tex]\\ \sf\longmapsto 2x=12[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{12}{2}[/tex]
[tex]\\ \sf\longmapsto x=6[/tex]