MHB How many stickers did Angel and Kareem have altogether?

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Angel and Kareem had some stickers. Angel had 5 times as many stickers as Kareem. After Angel gave 36 stickers to Kareem, both of them had an equal number of stickers. How many stickers did they both have altogether
 
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Angel had 5 times as many stickers as Kareem

$a = 5k$

Angel gave 36 stickers to Kareem, both of them had an equal number of stickers.

$a-36 = k+36$

solve the system of equations
 

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