3x+21=-x+3

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



3x+21=-x+3

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(-1x+3)+21=0

We get rid of parentheses

3x+1x-3+21=0

We add all the numbers together, and all the variables

4x+18=0

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

4x=-18

x=-18/4

x=-4+1/2

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