12-5x=4-21x

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Solution for 12-5x=4-21x equation: 



12-5x=4-21x

We move all terms to the left:

12-5x-(4-21x)=0

We add all the numbers together, and all the variables

-5x-(-21x+4)+12=0

We get rid of parentheses

-5x+21x-4+12=0

We add all the numbers together, and all the variables

16x+8=0

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

16x=-8

x=-8/16

x=-1/2

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