(3x+x)=30

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



(3x+x)=30

We move all terms to the left:

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

We add all the numbers together, and all the variables

(+4x)-30=0

We get rid of parentheses

4x-30=0

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

4x=30

x=30/4

x=7+1/2

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