78.5=3.14*2r

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Solution for 78.5=3.14*2r equation: 


Simplifying
78.5 = 3.14 * 2r

Multiply 3.14 * 2
78.5 = 6.28r

Solving
78.5 = 6.28r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-6.28r' to each side of the equation.
78.5 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
78.5 + -6.28r = 0.00

Add '-78.5' to each side of the equation.
78.5 + -78.5 + -6.28r = 0.00 + -78.5

Combine like terms: 78.5 + -78.5 = 0.0
0.0 + -6.28r = 0.00 + -78.5
-6.28r = 0.00 + -78.5

Combine like terms: 0.00 + -78.5 = -78.5
-6.28r = -78.5

Divide each side by '-6.28'.
r = 12.5

Simplifying
r = 12.5

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