300=-0.4x+400

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Solution for 300=-0.4x+400 equation: 



300=-0.4x+400

We move all terms to the left:

300-(-0.4x+400)=0

We get rid of parentheses

0.4x-400+300=0

We add all the numbers together, and all the variables

0.4x-100=0

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

0.4x=100

x=100/0.4

x=250

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