21=-2x+5

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Solution for 21=-2x+5 equation: 



21=-2x+5

We move all terms to the left:

21-(-2x+5)=0

We get rid of parentheses

2x-5+21=0

We add all the numbers together, and all the variables

2x+16=0

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

2x=-16

x=-16/2

x=-8

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