3a+7-a=2(4a+9)-(1-4a)

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Solution for 3a+7-a=2(4a+9)-(1-4a) equation:


3a+7-a=2(4a+9)-(1-4a)

We simplify the equation to the form, which is simple to understand 
3a+7-a=2(4a+9)-(1-4a)

Reorder the terms in parentheses
3a+7-a=+(+8a+18)-(1-4a)

Remove unnecessary parentheses
+3a+7-a=+8a+18-(+1-4a+)

Remove unnecessary parentheses
3a+7-a=+8a+18-1+4a

We move all terms containing a to the left and all other terms to the right. 
+3a-1a-8a-4a=+18-1-7

We simplify left and right side of the equation. 
-10a=+10

We divide both sides of the equation by -10 to get a. 
a=-1

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