-9x+4=21x-4

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



-9x+4=21x-4

We move all terms to the left:

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

We get rid of parentheses

-9x-21x+4+4=0

We add all the numbers together, and all the variables

-30x+8=0

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

-30x=-8

x=-8/-30

x=4/15

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