3x+5=x-21

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Solution for 3x+5=x-21 equation: 



3x+5=x-21

We move all terms to the left:

3x+5-(x-21)=0

We get rid of parentheses

3x-x+21+5=0

We add all the numbers together, and all the variables

2x+26=0

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

2x=-26

x=-26/2

x=-13

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