Mashaal Masha
$6r=7s+t$

The given equation relates the variables $r$, $s$, and $t$. Which equation correctly expresses $s$ in terms of $r$ and $t$?
Difficulty: Easy
A: 

$s=42r-t$

B: 

$s=7(6r-t)$

C: 

$s=\frac{6}{7}r-t$

D: 

$s=\frac{6r-t}{7}$

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