Calculate: 2x=9

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Expression: $$

Factor $ 7h+8j-3(7h-3j+7k):{\quad}-14h+17j-21k$

$=-14h+17j-21k$

Factor $ 7h+8j-3(7h-3j+7k):{\quad}-14h+17j-21k$

$=-14h+17j-21k$

Multiply each factor with the highest power:

$-14h+17j-21k$

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