12+3x=99

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Solution for 12+3x=99 equation: 



12+3x=99

We move all terms to the left:

12+3x-(99)=0

We add all the numbers together, and all the variables

3x-87=0

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

3x=87

x=87/3

x=29

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