7x+x-4x-x=12

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Solution for 7x+x-4x-x=12 equation: 



7x+x-4x-x=12

We move all terms to the left:

7x+x-4x-x-(12)=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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