12+x=0.85(15+x)

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Solution for 12+x=0.85(15+x) equation: 



12+x=0.85(15+x)

We move all terms to the left:

12+x-(0.85(15+x))=0

We add all the numbers together, and all the variables

x-(0.85(x+15))+12=0



We calculate terms in parentheses: -(0.85(x+15)), so:

0.85(x+15)

We multiply parentheses

0.85x+12.75

Back to the equation:

-(0.85x+12.75)



We get rid of parentheses

x-0.85x-12.75+12=0

We add all the numbers together, and all the variables

0.15x-0.75=0

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

0.15x=0.75

x=0.75/0.15

x=5

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