18-4x=21-7x

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Solution for 18-4x=21-7x equation: 



18-4x=21-7x

We move all terms to the left:

18-4x-(21-7x)=0

We add all the numbers together, and all the variables

-4x-(-7x+21)+18=0

We get rid of parentheses

-4x+7x-21+18=0

We add all the numbers together, and all the variables

3x-3=0

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

3x=3

x=3/3

x=1

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