20-4x=21-5x

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Solution for 20-4x=21-5x equation: 



20-4x=21-5x

We move all terms to the left:

20-4x-(21-5x)=0

We add all the numbers together, and all the variables

-4x-(-5x+21)+20=0

We get rid of parentheses

-4x+5x-21+20=0

We add all the numbers together, and all the variables

x-1=0

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

x=1

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