7x-21=-2x+15

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Solution for 7x-21=-2x+15 equation: 



7x-21=-2x+15

We move all terms to the left:

7x-21-(-2x+15)=0

We get rid of parentheses

7x+2x-15-21=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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