31.4=3.14*2*r

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Solution for 31.4=3.14*2*r equation:


Simplifying
31.4 = 3.14 * 2r

Multiply 3.14 * 2
31.4 = 6.28r

Solving
31.4 = 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.
31.4 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
31.4 + -6.28r = 0.00

Add '-31.4' to each side of the equation.
31.4 + -31.4 + -6.28r = 0.00 + -31.4

Combine like terms: 31.4 + -31.4 = 0.0
0.0 + -6.28r = 0.00 + -31.4
-6.28r = 0.00 + -31.4

Combine like terms: 0.00 + -31.4 = -31.4
-6.28r = -31.4

Divide each side by '-6.28'.
r = 5

Simplifying
r = 5

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