x+3x+8=20

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Solution for x+3x+8=20 equation: 



x+3x+8=20

We move all terms to the left:

x+3x+8-(20)=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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