25.12=3.14*2*r

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Solution for 25.12=3.14*2*r equation: 


Simplifying
25.12 = 3.14 * 2r

Multiply 3.14 * 2
25.12 = 6.28r

Solving
25.12 = 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.
25.12 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
25.12 + -6.28r = 0.00

Add '-25.12' to each side of the equation.
25.12 + -25.12 + -6.28r = 0.00 + -25.12

Combine like terms: 25.12 + -25.12 = 0.00
0.00 + -6.28r = 0.00 + -25.12
-6.28r = 0.00 + -25.12

Combine like terms: 0.00 + -25.12 = -25.12
-6.28r = -25.12

Divide each side by '-6.28'.
r = 4

Simplifying
r = 4

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