r^2+36+12r=81+r^2

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Solution for r^2+36+12r=81+r^2 equation:


Simplifying
r2 + 36 + 12r = 81 + r2

Reorder the terms:
36 + 12r + r2 = 81 + r2

Add '-1r2' to each side of the equation.
36 + 12r + r2 + -1r2 = 81 + r2 + -1r2

Combine like terms: r2 + -1r2 = 0
36 + 12r + 0 = 81 + r2 + -1r2
36 + 12r = 81 + r2 + -1r2

Combine like terms: r2 + -1r2 = 0
36 + 12r = 81 + 0
36 + 12r = 81

Solving
36 + 12r = 81

Solving for variable 'r'.

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

Add '-36' to each side of the equation.
36 + -36 + 12r = 81 + -36

Combine like terms: 36 + -36 = 0
0 + 12r = 81 + -36
12r = 81 + -36

Combine like terms: 81 + -36 = 45
12r = 45

Divide each side by '12'.
r = 3.75

Simplifying
r = 3.75

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