0.09*(100-x)+0.4x=25

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Solution for 0.09*(100-x)+0.4x=25 equation: 



0.09(100-x)+0.4x=25

We move all terms to the left:

0.09(100-x)+0.4x-(25)=0

We add all the numbers together, and all the variables

0.09(-1x+100)+0.4x-25=0

We add all the numbers together, and all the variables

0.4x+0.09(-1x+100)-25=0

We multiply parentheses

0.4x-0.09x+9-25=0

We add all the numbers together, and all the variables

0.31x-16=0

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

0.31x=16

x=16/0.31

x=51+0.19/0.31

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