21-9+4x-5x=8x-7x+4

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Solution for 21-9+4x-5x=8x-7x+4 equation: 



21-9+4x-5x=8x-7x+4

We move all terms to the left:

21-9+4x-5x-(8x-7x+4)=0

We add all the numbers together, and all the variables

4x-5x-(x+4)+21-9=0

We add all the numbers together, and all the variables

-1x-(x+4)+12=0

We get rid of parentheses

-1x-x-4+12=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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