3x^3-21=7

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Solution for 3x^3-21=7 equation:


Simplifying
3x3 + -21 = 7

Reorder the terms:
-21 + 3x3 = 7

Solving
-21 + 3x3 = 7

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 3x3 = 7 + 21

Combine like terms: -21 + 21 = 0
0 + 3x3 = 7 + 21
3x3 = 7 + 21

Combine like terms: 7 + 21 = 28
3x3 = 28

Divide each side by '3'.
x3 = 9.333333333

Simplifying
x3 = 9.333333333

Reorder the terms:
-9.333333333 + x3 = 9.333333333 + -9.333333333

Combine like terms: 9.333333333 + -9.333333333 = 0.000000000
-9.333333333 + x3 = 0.000000000

The solution to this equation could not be determined.

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