3x+4x-20=8

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Solution for 3x+4x-20=8 equation: 



3x+4x-20=8

We move all terms to the left:

3x+4x-20-(8)=0

We add all the numbers together, and all the variables

7x-28=0

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

7x=28

x=28/7

x=4

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