3x+21=4x-20

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Solution for 3x+21=4x-20 equation: 



3x+21=4x-20

We move all terms to the left:

3x+21-(4x-20)=0

We get rid of parentheses

3x-4x+20+21=0

We add all the numbers together, and all the variables

-1x+41=0

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

-x=-41

x=-41/-1

x=+41

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