7x-3=4x-3-21

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Solution for 7x-3=4x-3-21 equation: 



7x-3=4x-3-21

We move all terms to the left:

7x-3-(4x-3-21)=0

We add all the numbers together, and all the variables

7x-(4x-24)-3=0

We get rid of parentheses

7x-4x+24-3=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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