3x+12x=30

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Solution for 3x+12x=30 equation: 



3x+12x=30

We move all terms to the left:

3x+12x-(30)=0

We add all the numbers together, and all the variables

15x-30=0

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

15x=30

x=30/15

x=2

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