0.15x+0.3(100-x)=90

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Solution for 0.15x+0.3(100-x)=90 equation: 



0.15x+0.3(100-x)=90

We move all terms to the left:

0.15x+0.3(100-x)-(90)=0

We add all the numbers together, and all the variables

0.15x+0.3(-1x+100)-90=0

We multiply parentheses

0.15x-0.3x+30-90=0

We add all the numbers together, and all the variables

-0.15x-60=0

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

-0.15x=60

x=60/-0.15

x=-400

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