4x-21=-42x-21

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Solution for 4x-21=-42x-21 equation: 



4x-21=-42x-21

We move all terms to the left:

4x-21-(-42x-21)=0

We get rid of parentheses

4x+42x+21-21=0

We add all the numbers together, and all the variables

46x=0

x=0/46

x=0

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