(2.1*25)*18.7=2.1*(5r*18.7)

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Solution for (2.1*25)*18.7=2.1*(5r*18.7) equation: 



(2.1*25)*18.7=2.1(5r*18.7)

We move all terms to the left:

(2.1*25)*18.7-(2.1(5r*18.7))=0

We add all the numbers together, and all the variables

-(2.1(+5r*18.7))+(52.5)*18.7=0

We add all the numbers together, and all the variables

-(2.1(+5r*18.7))+981.75=0



We calculate terms in parentheses: -(2.1(+5r*18.7)), so:

2.1(+5r*18.7)

We multiply parentheses

196.35r

Back to the equation:

-(196.35r)



We add all the numbers together, and all the variables

-(+196.35r)+981.75=0

We get rid of parentheses

-196.35r+981.75=0

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

-196.35r=-981.75

r=-981.75/-196.35

r=+5

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