21=-3x+75

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Solution for 21=-3x+75 equation: 



21=-3x+75

We move all terms to the left:

21-(-3x+75)=0

We get rid of parentheses

3x-75+21=0

We add all the numbers together, and all the variables

3x-54=0

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

3x=54

x=54/3

x=18

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