3a+(7a+4)+(2a-4)=180

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Solution for 3a+(7a+4)+(2a-4)=180 equation:


3a+(7a+4)+(2a-4)=180

We simplify the equation to the form, which is simple to understand 
3a+(7a+4)+(2a-4)=180

Remove unnecessary parentheses
+3a+7a+4+(+2a-4+)=+180

Remove unnecessary parentheses
+3a+7a+4+2a-4=+180

We move all terms containing a to the left and all other terms to the right. 
+3a+7a+2a=+180-4+4

We simplify left and right side of the equation. 
+12a=+180

We divide both sides of the equation by 12 to get a. 
a=15

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