33=[a+12]

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Solution for 33=[a+12] equation:


33=[a+12]

We simplify the equation to the form, which is simple to understand 
33=(a+12)

Remove unnecessary parentheses
33=a+12

We move all terms containing a to the left and all other terms to the right. 
-1a=+12-33

We simplify left and right side of the equation. 
-1a=-21

We divide both sides of the equation by -01 to get a. 
a=21

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