12x+9x-7=13x+9

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Solution for 12x+9x-7=13x+9 equation: 



12x+9x-7=13x+9

We move all terms to the left:

12x+9x-7-(13x+9)=0

We add all the numbers together, and all the variables

21x-(13x+9)-7=0

We get rid of parentheses

21x-13x-9-7=0

We add all the numbers together, and all the variables

8x-16=0

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

8x=16

x=16/8

x=2

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