-57=3(-7-3a)+3(6-3a)

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Solution for -57=3(-7-3a)+3(6-3a) equation:


-57=3(-7-3a)+3(6-3a)

We simplify the equation to the form, which is simple to understand 
-57=3(-7-3a)+3(6-3a)

Reorder the terms in parentheses
-57=+(-21-9a)+3*(6-3a)

Remove unnecessary parentheses
-57=-21-9a+3+*(+6-3a+)

Reorder the terms in parentheses
-57=-21-9a+(+18-9a)

Remove unnecessary parentheses
-57=-21-9a+18-9a

We move all terms containing a to the left and all other terms to the right. 
+9a+9a=-21+18+57

We simplify left and right side of the equation. 
+18a=+54

We divide both sides of the equation by 18 to get a. 
a=3

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