21=2x+3-5x

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Solution for 21=2x+3-5x equation: 



21=2x+3-5x

We move all terms to the left:

21-(2x+3-5x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x-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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