3x+12+x=4

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Solution for 3x+12+x=4 equation: 



3x+12+x=4

We move all terms to the left:

3x+12+x-(4)=0

We add all the numbers together, and all the variables

4x+8=0

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

4x=-8

x=-8/4

x=-2

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