4=-2.1x+25

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Solution for 4=-2.1x+25 equation: 



4=-2.1x+25

We move all terms to the left:

4-(-2.1x+25)=0

We get rid of parentheses

2.1x-25+4=0

We add all the numbers together, and all the variables

2.1x-21=0

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

2.1x=21

x=21/2.1

x=10

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