5x+7x-42=105-9x

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Solution for 5x+7x-42=105-9x equation: 



5x+7x-42=105-9x

We move all terms to the left:

5x+7x-42-(105-9x)=0

We add all the numbers together, and all the variables

5x+7x-(-9x+105)-42=0

We add all the numbers together, and all the variables

12x-(-9x+105)-42=0

We get rid of parentheses

12x+9x-105-42=0

We add all the numbers together, and all the variables

21x-147=0

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

21x=147

x=147/21

x=7

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