21=13x+18

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Solution for 21=13x+18 equation: 



21=13x+18

We move all terms to the left:

21-(13x+18)=0

We get rid of parentheses

-13x-18+21=0

We add all the numbers together, and all the variables

-13x+3=0

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

-13x=-3

x=-3/-13

x=3/13

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