5x+18=2x+21.

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Solution for 5x+18=2x+21. equation: 



5x+18=2x+21.

We move all terms to the left:

5x+18-(2x+21.)=0

We add all the numbers together, and all the variables

5x-(2x+21)+18=0

We get rid of parentheses

5x-2x-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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