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+16=0

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

2x=-16

x=-16/2

x=-8

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