3x-12.9=4.2

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Solution for 3x-12.9=4.2 equation: 



3x-12.9=4.2

We move all terms to the left:

3x-12.9-(4.2)=0

We add all the numbers together, and all the variables

3x-17.1=0

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

3x=17.1

x=17.1/3

x=5+2.1/3

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