9x+21=3x+18

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Solution for 9x+21=3x+18 equation: 



9x+21=3x+18

We move all terms to the left:

9x+21-(3x+18)=0

We get rid of parentheses

9x-3x-18+21=0

We add all the numbers together, and all the variables

6x+3=0

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

6x=-3

x=-3/6

x=-1/2

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