5.1(-29a-21)=-45.9(-9a+17)

Solution for 5.1(-29a-21)=-45.9(-9a+17) equation:

5.1(-29a-21)=-45.9(-9a+17)

We simplify the equation to the form, which is simple to understand 
5.1(-29a-21)=-45.9(-9a+17)

Reorder the terms in parentheses
+(-147.9a-107.1)=-45.9*(-9a+17)

Remove unnecessary parentheses
-147.9a-107.1=-45.9+*(-9a+17+)

Reorder the terms in parentheses
-147.9a-107.1=+(+413.1a-780.3)

Remove unnecessary parentheses
-147.9a-107.1=+413.1a-780.3

We move all terms containing a to the left and all other terms to the right. 
-147.9a-413.1a=-780.3+107.1

We simplify left and right side of the equation. 
-561a=-673.2

We divide both sides of the equation by -561 to get a. 
a=1.2