4x-21=7x=

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



4x-21=7x=
We move all terms to the left:
4x-21-(7x)=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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