7.78=2(3.14)r

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Solution for 7.78=2(3.14)r equation: 


Simplifying
7.78 = 2(3.14) * r

Multiply 2 * 3.14
7.78 = 6.28r

Solving
7.78 = 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.
7.78 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
7.78 + -6.28r = 0.00

Add '-7.78' to each side of the equation.
7.78 + -7.78 + -6.28r = 0.00 + -7.78

Combine like terms: 7.78 + -7.78 = 0.00
0.00 + -6.28r = 0.00 + -7.78
-6.28r = 0.00 + -7.78

Combine like terms: 0.00 + -7.78 = -7.78
-6.28r = -7.78

Divide each side by '-6.28'.
r = 1.238853503

Simplifying
r = 1.238853503

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