12x+9x=15+8x

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Solution for 12x+9x=15+8x equation: 



12x+9x=15+8x

We move all terms to the left:

12x+9x-(15+8x)=0

We add all the numbers together, and all the variables

12x+9x-(8x+15)=0

We add all the numbers together, and all the variables

21x-(8x+15)=0

We get rid of parentheses

21x-8x-15=0

We add all the numbers together, and all the variables

13x-15=0

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

13x=15

x=15/13

x=1+2/13

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