7x-5=3x-21

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Solution for 7x-5=3x-21 equation: 



7x-5=3x-21

We move all terms to the left:

7x-5-(3x-21)=0

We get rid of parentheses

7x-3x+21-5=0

We add all the numbers together, and all the variables

4x+16=0

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

4x=-16

x=-16/4

x=-4

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