21x+27=15x-27

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Solution for 21x+27=15x-27 equation: 



21x+27=15x-27

We move all terms to the left:

21x+27-(15x-27)=0

We get rid of parentheses

21x-15x+27+27=0

We add all the numbers together, and all the variables

6x+54=0

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

6x=-54

x=-54/6

x=-9

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