30-12+3x=45

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Solution for 30-12+3x=45 equation: 



30-12+3x=45

We move all terms to the left:

30-12+3x-(45)=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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