x+3x=12+4

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



x+3x=12+4

We move all terms to the left:

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

We add all the numbers together, and all the variables

x+3x-16=0

We add all the numbers together, and all the variables

4x-16=0

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

4x=16

x=16/4

x=4

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