21=r^3+3

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Solution for 21=r^3+3 equation:


Simplifying
21 = r3 + 3

Reorder the terms:
21 = 3 + r3

Solving
21 = 3 + r3

Solving for variable 'r'.

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

Add '-1r3' to each side of the equation.
21 + -1r3 = 3 + r3 + -1r3

Combine like terms: r3 + -1r3 = 0
21 + -1r3 = 3 + 0
21 + -1r3 = 3

Add '-21' to each side of the equation.
21 + -21 + -1r3 = 3 + -21

Combine like terms: 21 + -21 = 0
0 + -1r3 = 3 + -21
-1r3 = 3 + -21

Combine like terms: 3 + -21 = -18
-1r3 = -18

Divide each side by '-1'.
r3 = 18

Simplifying
r3 = 18

Reorder the terms:
-18 + r3 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + r3 = 0

The solution to this equation could not be determined.

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