8x-9x-21=105-4x

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Solution for 8x-9x-21=105-4x equation: 



8x-9x-21=105-4x

We move all terms to the left:

8x-9x-21-(105-4x)=0

We add all the numbers together, and all the variables

8x-9x-(-4x+105)-21=0

We add all the numbers together, and all the variables

-1x-(-4x+105)-21=0

We get rid of parentheses

-1x+4x-105-21=0

We add all the numbers together, and all the variables

3x-126=0

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

3x=126

x=126/3

x=42

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