87.92=2r*3.14*x+9

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Solution for 87.92=2r*3.14*x+9 equation: 


Simplifying
87.92 = 2r * 3.14x + 9

Reorder the terms for easier multiplication:
87.92 = 2 * 3.14r * x + 9

Multiply 2 * 3.14
87.92 = 6.28r * x + 9

Multiply r * x
87.92 = 6.28rx + 9

Reorder the terms:
87.92 = 9 + 6.28rx

Solving
87.92 = 9 + 6.28rx

Solving for variable 'r'.

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

Add '-6.28rx' to each side of the equation.
87.92 + -6.28rx = 9 + 6.28rx + -6.28rx

Combine like terms: 6.28rx + -6.28rx = 0.00
87.92 + -6.28rx = 9 + 0.00
87.92 + -6.28rx = 9

Add '-87.92' to each side of the equation.
87.92 + -87.92 + -6.28rx = 9 + -87.92

Combine like terms: 87.92 + -87.92 = 0.00
0.00 + -6.28rx = 9 + -87.92
-6.28rx = 9 + -87.92

Combine like terms: 9 + -87.92 = -78.92
-6.28rx = -78.92

Divide each side by '-6.28x'.
r = 12.56687898x-1

Simplifying
r = 12.56687898x-1

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