0.40x+0.20(100-x)=31

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Solution for 0.40x+0.20(100-x)=31 equation: 



0.40x+0.20(100-x)=31

We move all terms to the left:

0.40x+0.20(100-x)-(31)=0

We add all the numbers together, and all the variables

0.40x+0.20(-1x+100)-31=0

We multiply parentheses

0.40x-0.2x+20-31=0

We add all the numbers together, and all the variables

0.2x-11=0

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

0.2x=11

x=11/0.2

x=55

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