3x+6=-7x+21

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Solution for 3x+6=-7x+21 equation: 



3x+6=-7x+21

We move all terms to the left:

3x+6-(-7x+21)=0

We get rid of parentheses

3x+7x-21+6=0

We add all the numbers together, and all the variables

10x-15=0

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

10x=15

x=15/10

x=1+1/2

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