a*3+4+a=20

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Solution for a*3+4+a=20 equation: 



a*3+4+a=20

We move all terms to the left:

a*3+4+a-(20)=0

We add all the numbers together, and all the variables

a+a*3-16=0

Wy multiply elements

a+3a-16=0

We add all the numbers together, and all the variables

4a-16=0

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

4a=16

a=16/4

a=4

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