3x=12-30

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Solution for 3x=12-30 equation: 



3x=12-30

We move all terms to the left:

3x-(12-30)=0

We add all the numbers together, and all the variables

3x-(-18)=0

We add all the numbers together, and all the variables

3x+18=0

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

3x=-18

x=-18/3

x=-6

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