21-4x=2x+3

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Solution for 21-4x=2x+3 equation: 



21-4x=2x+3

We move all terms to the left:

21-4x-(2x+3)=0

We get rid of parentheses

-4x-2x-3+21=0

We add all the numbers together, and all the variables

-6x+18=0

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

-6x=-18

x=-18/-6

x=+3

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