21-18x=13x-15-7x

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Solution for 21-18x=13x-15-7x equation: 



21-18x=13x-15-7x

We move all terms to the left:

21-18x-(13x-15-7x)=0

We add all the numbers together, and all the variables

-18x-(6x-15)+21=0

We get rid of parentheses

-18x-6x+15+21=0

We add all the numbers together, and all the variables

-24x+36=0

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

-24x=-36

x=-36/-24

x=1+1/2

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