6x-7=-x+21

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



6x-7=-x+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

6x-(-1x+21)-7=0

We get rid of parentheses

6x+1x-21-7=0

We add all the numbers together, and all the variables

7x-28=0

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

7x=28

x=28/7

x=4

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