Answer :

konrad509
[tex]6a-12=8a\\ 8a-6a=-12\\ 2a=-12\\ a=-6[/tex]
ValyRemus
[tex]6a-12=8a[/tex]

[tex]6a-8a=12[/tex]

[tex]-2a=12[/tex] ⇒ [tex]a= \frac{12}{-2} [/tex]

[tex]\boxed {a=-6}[/tex]

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