x+21=-x+3+5x

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Solution for x+21=-x+3+5x equation: 



x+21=-x+3+5x

We move all terms to the left:

x+21-(-x+3+5x)=0

We add all the numbers together, and all the variables

x-(4x+3)+21=0

We get rid of parentheses

x-4x-3+21=0

We add all the numbers together, and all the variables

-3x+18=0

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

-3x=-18

x=-18/-3

x=+6

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