21=75+2x

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Solution for 21=75+2x equation: 



21=75+2x

We move all terms to the left:

21-(75+2x)=0

We add all the numbers together, and all the variables

-(2x+75)+21=0

We get rid of parentheses

-2x-75+21=0

We add all the numbers together, and all the variables

-2x-54=0

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

-2x=54

x=54/-2

x=-27

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