0.9x+0.4(100-x)=0.85*100

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Solution for 0.9x+0.4(100-x)=0.85*100 equation: 



0.9x+0.4(100-x)=0.85*100

We move all terms to the left:

0.9x+0.4(100-x)-(0.85*100)=0

We add all the numbers together, and all the variables

0.9x+0.4(-1x+100)-85=0

We multiply parentheses

0.9x-0.4x+40-85=0

We add all the numbers together, and all the variables

0.5x-45=0

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

0.5x=45

x=45/0.5

x=90

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