4+19x=21x-4

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Solution for 4+19x=21x-4 equation: 



4+19x=21x-4

We move all terms to the left:

4+19x-(21x-4)=0

We get rid of parentheses

19x-21x+4+4=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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