Mashaal Masha
$a(3-x)-b=-1-2x$

In the equation above, $a$ and $b$ are constants. If the equation has infinitely many solutions, what are the values of $a$ and $b$?
Difficulty: Medium
A: 

$a=2$ and $b=1$

B: 

$a=2$ and $b=7$

C: 

$a=-2$ and $b=5$

D: 

$a=-2$ and $b=-5$

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