4x+21=x+18

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Solution for 4x+21=x+18 equation: 



4x+21=x+18

We move all terms to the left:

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

We get rid of parentheses

4x-x-18+21=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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