78.5=2(3.14)(R)

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Solution for 78.5=2(3.14)(R) equation:


78.5=2(3.14)(r)

We simplify the equation to the form, which is simple to understand 
78.5=2(3.14)*(r)

Reorder the terms in parentheses
multiplication of parentheses
78.5=2*(+3.14r)



Reorder the terms in parentheses
78.5=+(+6.28r)

Remove unnecessary parentheses
+78.5=+6.28r

We move all terms containing r to the left and all other terms to the right. 
-6.28r=-78.5

We simplify left and right side of the equation. 
-6.28r=-78.5

We divide both sides of the equation by -06.28 to get r. 
r=12.5

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