3x+4=5+8

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Solution for 3x+4=5+8 equation: 



3x+4=5+8

We move all terms to the left:

3x+4-(5+8)=0

We add all the numbers together, and all the variables

3x+4-13=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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