Answer :

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[tex]20.6 + 2.1x = -8.2x[/tex]

[tex]20.6=-10.3x[/tex]

[tex]-2=x[/tex]
[tex] 20.6 + 2.1x = -8.2x \\ 2.1x+8.2x=-20.6 \\ 10.3x=-20.6 \\ x=- \frac{20.6}{10.3} \\ \boxed{x=-2}[/tex]

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