3x+21=7x-43

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Solution for 3x+21=7x-43 equation: 



3x+21=7x-43

We move all terms to the left:

3x+21-(7x-43)=0

We get rid of parentheses

3x-7x+43+21=0

We add all the numbers together, and all the variables

-4x+64=0

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

-4x=-64

x=-64/-4

x=+16

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