7x^3+21x-7=17x+7x^3+77

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Solution for 7x^3+21x-7=17x+7x^3+77 equation:


Simplifying
7x3 + 21x + -7 = 17x + 7x3 + 77

Reorder the terms:
-7 + 21x + 7x3 = 17x + 7x3 + 77

Reorder the terms:
-7 + 21x + 7x3 = 77 + 17x + 7x3

Add '-7x3' to each side of the equation.
-7 + 21x + 7x3 + -7x3 = 77 + 17x + 7x3 + -7x3

Combine like terms: 7x3 + -7x3 = 0
-7 + 21x + 0 = 77 + 17x + 7x3 + -7x3
-7 + 21x = 77 + 17x + 7x3 + -7x3

Combine like terms: 7x3 + -7x3 = 0
-7 + 21x = 77 + 17x + 0
-7 + 21x = 77 + 17x

Solving
-7 + 21x = 77 + 17x

Solving for variable 'x'.

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

Add '-17x' to each side of the equation.
-7 + 21x + -17x = 77 + 17x + -17x

Combine like terms: 21x + -17x = 4x
-7 + 4x = 77 + 17x + -17x

Combine like terms: 17x + -17x = 0
-7 + 4x = 77 + 0
-7 + 4x = 77

Add '7' to each side of the equation.
-7 + 7 + 4x = 77 + 7

Combine like terms: -7 + 7 = 0
0 + 4x = 77 + 7
4x = 77 + 7

Combine like terms: 77 + 7 = 84
4x = 84

Divide each side by '4'.
x = 21

Simplifying
x = 21

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