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(0.3x*0.15+0.3x)+(0.5x*0.1+0.5x)+(0.2x*0.05+0.2x)=100000
We move all terms to the left:
(0.3x*0.15+0.3x)+(0.5x*0.1+0.5x)+(0.2x*0.05+0.2x)-(100000)=0
We add all the numbers together, and all the variables
(+0.3x+0.3x*0.15)+(+0.5x+0.5x*0.1)+(+0.2x+0.2x*0.05)-100000=0
We get rid of parentheses
0.3x+0.3x*0.15+0.5x+0.5x*0.1+0.2x+0.2x*0.05-100000=0
We add all the numbers together, and all the variables
x+0.3x*0.15+0.5x*0.1+0.2x*0.05-100000=0
We move all terms containing x to the left, all other terms to the right
x+0.3x*0.15+0.5x*0.1+0.2x*0.05=100000
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