a+(a*3)=640

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Solution for a+(a*3)=640 equation: 



a+(a*3)=640

We move all terms to the left:

a+(a*3)-(640)=0

We add all the numbers together, and all the variables

a+(+a*3)-640=0

We get rid of parentheses

a+a*3-640=0

Wy multiply elements

a+3a-640=0

We add all the numbers together, and all the variables

4a-640=0

We move all terms containing a to the left, all other terms to the right

4a=640

a=640/4

a=160

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