3.2x+9=12

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Solution for 3.2x+9=12 equation: 



3.2x+9=12

We move all terms to the left:

3.2x+9-(12)=0

We add all the numbers together, and all the variables

3.2x-3=0

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

3.2x=3

x=3/3.2

x=1/1.0666666666667

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