(9x-21)=15

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Solution for (9x-21)=15 equation: 



(9x-21)=15

We move all terms to the left:

(9x-21)-(15)=0

We get rid of parentheses

9x-21-15=0

We add all the numbers together, and all the variables

9x-36=0

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

9x=36

x=36/9

x=4

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