3x+7(3x=4)

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Solution for 3x+7(3x=4) equation: 



3x+7(3x=4)

We move all terms to the left:

3x+7(3x-(4))=0

We multiply parentheses

3x+21x-28=0

We add all the numbers together, and all the variables

24x-28=0

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

24x=28

x=28/24

x=1+1/6

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