x+21=-3x+45

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Solution for x+21=-3x+45 equation: 



x+21=-3x+45

We move all terms to the left:

x+21-(-3x+45)=0

We get rid of parentheses

x+3x-45+21=0

We add all the numbers together, and all the variables

4x-24=0

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

4x=24

x=24/4

x=6

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