12x+3x=7

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Solution for 12x+3x=7 equation: 



12x+3x=7

We move all terms to the left:

12x+3x-(7)=0

We add all the numbers together, and all the variables

15x-7=0

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

15x=7

x=7/15

x=7/15

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