3x+x+3x+x=30

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Solution for 3x+x+3x+x=30 equation: 



3x+x+3x+x=30

We move all terms to the left:

3x+x+3x+x-(30)=0

We add all the numbers together, and all the variables

8x-30=0

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

8x=30

x=30/8

x=3+3/4

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