7x+5x-21=105-9x

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Solution for 7x+5x-21=105-9x equation: 



7x+5x-21=105-9x

We move all terms to the left:

7x+5x-21-(105-9x)=0

We add all the numbers together, and all the variables

7x+5x-(-9x+105)-21=0

We add all the numbers together, and all the variables

12x-(-9x+105)-21=0

We get rid of parentheses

12x+9x-105-21=0

We add all the numbers together, and all the variables

21x-126=0

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

21x=126

x=126/21

x=6

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