x(.80)+(20-x)(1.25)=20(1.09)

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Solution for x(.80)+(20-x)(1.25)=20(1.09) equation: 



x(.80)+(20-x)(1.25)=20(1.09)

We move all terms to the left:

x(.80)+(20-x)(1.25)-(20(1.09))=0

We add all the numbers together, and all the variables

x(0.8)+(-1x+20)(1.25)-(20(1.09))=0

We add all the numbers together, and all the variables

x(0.8)+(-1x+20)(1.25)-21.8=0

We multiply parentheses

0.8x+(-1x+20)(1.25)-21.8=0

We multiply parentheses ..

0.8x+(-1.25x+25)-21.8=0

We get rid of parentheses

0.8x-1.25x+25-21.8=0

We add all the numbers together, and all the variables

-0.45x+3.2=0

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

-0.45x=-3.2

x=-3.2/-0.45

x=7+0.05/0.45

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