7.85=2(3.14r)

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Solution for 7.85=2(3.14r) equation: 


Simplifying
7.85 = 2(3.14r)

Remove parenthesis around (3.14r)
7.85 = 2 * 3.14r

Multiply 2 * 3.14
7.85 = 6.28r

Solving
7.85 = 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.
7.85 + -6.28r = 6.28r + -6.28r

Combine like terms: 6.28r + -6.28r = 0.00
7.85 + -6.28r = 0.00

Add '-7.85' to each side of the equation.
7.85 + -7.85 + -6.28r = 0.00 + -7.85

Combine like terms: 7.85 + -7.85 = 0.00
0.00 + -6.28r = 0.00 + -7.85
-6.28r = 0.00 + -7.85

Combine like terms: 0.00 + -7.85 = -7.85
-6.28r = -7.85

Divide each side by '-6.28'.
r = 1.25

Simplifying
r = 1.25

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