45+(0.2n)=100

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Solution for 45+(0.2n)=100 equation: 



45+(0.2n)=100

We move all terms to the left:

45+(0.2n)-(100)=0

We add all the numbers together, and all the variables

(+0.2n)+45-100=0

We add all the numbers together, and all the variables

(+0.2n)-55=0

We get rid of parentheses

0.2n-55=0

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

0.2n=55

n=55/0.2

n=275

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