1+a-9-4=0

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Solution for 1+a-9-4=0 equation:


1+a-9-4=0

We simplify the equation to the form, which is simple to understand 
1+a-9-4=0

We move all terms containing a to the left and all other terms to the right. 
+1a=0-1+9+4

We simplify left and right side of the equation. 
+1a=+12

We divide both sides of the equation by 1 to get a. 
a=12

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