12=-1(9)+b

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Solution for 12=-1(9)+b equation:


12=-1(9)+b

We simplify the equation to the form, which is simple to understand 
12=-1(9)+b

Reorder the terms in parentheses
12=+(-9)+b

Remove unnecessary parentheses
+12=-9+b

We move all terms containing b to the left and all other terms to the right. 
-1b=-9-12

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

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

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