15*(1-0,4)=15*(1-0,25)*(1-x)

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Solution for 15*(1-0,4)=15*(1-0,25)*(1-x) equation: 



15(1-0.4)=15(1-0.25)(1-x)

We move all terms to the left:

15(1-0.4)-(15(1-0.25)(1-x))=0

We add all the numbers together, and all the variables

-(15(0.75)(-1x+1))+15(0.6)=0

We add all the numbers together, and all the variables

-(15(0.75)(-1x+1))+9=0

We multiply parentheses ..

-(15(-0.75x+0.75))+9=0



We calculate terms in parentheses: -(15(-0.75x+0.75)), so:

15(-0.75x+0.75)

We multiply parentheses

0x+11.25

We add all the numbers together, and all the variables

x+11.25

Back to the equation:

-(x+11.25)



We get rid of parentheses

-x-11.25+9=0

We add all the numbers together, and all the variables

-1x-2.25=0

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

-x=2.25

x=2.25/-1

x=-2+0.25/1

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