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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

16x-(-5x+105)-21=0

We get rid of parentheses

16x+5x-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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