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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

13x-(-8x+105)-21=0

We get rid of parentheses

13x+8x-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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