0.30x+0.10(100-x)=28

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Solution for 0.30x+0.10(100-x)=28 equation: 



0.30x+0.10(100-x)=28

We move all terms to the left:

0.30x+0.10(100-x)-(28)=0

We add all the numbers together, and all the variables

0.30x+0.10(-1x+100)-28=0

We multiply parentheses

0.30x-0.1x+10-28=0

We add all the numbers together, and all the variables

0.2x-18=0

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

0.2x=18

x=18/0.2

x=90

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