15x-129=99+3x

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Solution for 15x-129=99+3x equation: 



15x-129=99+3x

We move all terms to the left:

15x-129-(99+3x)=0

We add all the numbers together, and all the variables

15x-(3x+99)-129=0

We get rid of parentheses

15x-3x-99-129=0

We add all the numbers together, and all the variables

12x-228=0

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

12x=228

x=228/12

x=19

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