2x+21=-x+45

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Solution for 2x+21=-x+45 equation: 



2x+21=-x+45

We move all terms to the left:

2x+21-(-x+45)=0

We add all the numbers together, and all the variables

2x-(-1x+45)+21=0

We get rid of parentheses

2x+1x-45+21=0

We add all the numbers together, and all the variables

3x-24=0

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

3x=24

x=24/3

x=8

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