12x+3-9x=18

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Solution for 12x+3-9x=18 equation: 



12x+3-9x=18

We move all terms to the left:

12x+3-9x-(18)=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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