20=2-4.5a

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Solution for 20=2-4.5a equation:


20=2-4.5a

We simplify the equation to the form, which is simple to understand 
20=2-4.5a

We move all terms containing a to the left and all other terms to the right. 
+4.5a=+2-20

We simplify left and right side of the equation. 
+4.5a=-18

We divide both sides of the equation by 04.5 to get a. 
a=-4

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