7.89=2(3.14)r

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Solution for 7.89=2(3.14)r equation:


Simplifying
7.89 = 2(3.14) * r

Multiply 2 * 3.14
7.89 = 6.28r

Solving
7.89 = 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.
7.89 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
7.89 + -6.28r = 0.00

Add '-7.89' to each side of the equation.
7.89 + -7.89 + -6.28r = 0.00 + -7.89

Combine like terms: 7.89 + -7.89 = 0.00
0.00 + -6.28r = 0.00 + -7.89
-6.28r = 0.00 + -7.89

Combine like terms: 0.00 + -7.89 = -7.89
-6.28r = -7.89

Divide each side by '-6.28'.
r = 1.256369427

Simplifying
r = 1.256369427

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