21=-10x+1

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Solution for 21=-10x+1 equation: 



21=-10x+1

We move all terms to the left:

21-(-10x+1)=0

We get rid of parentheses

10x-1+21=0

We add all the numbers together, and all the variables

10x+20=0

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

10x=-20

x=-20/10

x=-2

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