x+(-0.15x)+(0.21x)=200

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Solution for x+(-0.15x)+(0.21x)=200 equation: 



x+(-0.15x)+(0.21x)=200

We move all terms to the left:

x+(-0.15x)+(0.21x)-(200)=0

We add all the numbers together, and all the variables

x+(-0.15x)+(+0.21x)-200=0

We get rid of parentheses

x-0.15x+0.21x-200=0

We add all the numbers together, and all the variables

1.06x-200=0

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

1.06x=200

x=200/1.06

x=188+0.72/1.06

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