a+2a+21=180

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Solution for a+2a+21=180 equation:


a+2a+21=180

We simplify the equation to the form, which is simple to understand 
a+2a+21=180

We move all terms containing a to the left and all other terms to the right. 
+1a+2a=+180-21

We simplify left and right side of the equation. 
+3a=+159

We divide both sides of the equation by 3 to get a. 
a=53

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