2x-4=-x+21

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Solution for 2x-4=-x+21 equation: 



2x-4=-x+21

We move all terms to the left:

2x-4-(-x+21)=0

We add all the numbers together, and all the variables

2x-(-1x+21)-4=0

We get rid of parentheses

2x+1x-21-4=0

We add all the numbers together, and all the variables

3x-25=0

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

3x=25

x=25/3

x=8+1/3

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