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

17x-(-4x+105)-21=0

We get rid of parentheses

17x+4x-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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