742.61=2*3.14*256+2*3.14*r*16

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Solution for 742.61=2*3.14*256+2*3.14*r*16 equation: 


Simplifying
742.61 = 2 * 3.14 * 256 + 2 * 3.14r * 16

Multiply 2 * 3.14
742.61 = 6.28 * 256 + 2 * 3.14r * 16

Multiply 6.28 * 256
742.61 = 1607.68 + 2 * 3.14r * 16

Reorder the terms for easier multiplication:
742.61 = 1607.68 + 2 * 3.14 * 16r

Multiply 2 * 3.14
742.61 = 1607.68 + 6.28 * 16r

Multiply 6.28 * 16
742.61 = 1607.68 + 100.48r

Solving
742.61 = 1607.68 + 100.48r

Solving for variable 'r'.

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

Add '-100.48r' to each side of the equation.
742.61 + -100.48r = 1607.68 + 100.48r + -100.48r

Combine like terms: 100.48r + -100.48r = 0.00
742.61 + -100.48r = 1607.68 + 0.00
742.61 + -100.48r = 1607.68

Add '-742.61' to each side of the equation.
742.61 + -742.61 + -100.48r = 1607.68 + -742.61

Combine like terms: 742.61 + -742.61 = 0.00
0.00 + -100.48r = 1607.68 + -742.61
-100.48r = 1607.68 + -742.61

Combine like terms: 1607.68 + -742.61 = 865.07
-100.48r = 865.07

Divide each side by '-100.48'.
r = -8.609375

Simplifying
r = -8.609375

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