21+(-3x)=3

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Solution for 21+(-3x)=3 equation: 



21+(-3x)=3

We move all terms to the left:

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

We add all the numbers together, and all the variables

(-3x)+18=0

We get rid of parentheses

-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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