9x^2+21x=3x(3x+7)

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Solution for 9x^2+21x=3x(3x+7) equation: 


Simplifying
9x2 + 21x = 3x(3x + 7)

Reorder the terms:
21x + 9x2 = 3x(3x + 7)

Reorder the terms:
21x + 9x2 = 3x(7 + 3x)
21x + 9x2 = (7 * 3x + 3x * 3x)
21x + 9x2 = (21x + 9x2)

Add '-21x' to each side of the equation.
21x + -21x + 9x2 = 21x + -21x + 9x2

Combine like terms: 21x + -21x = 0
0 + 9x2 = 21x + -21x + 9x2
9x2 = 21x + -21x + 9x2

Combine like terms: 21x + -21x = 0
9x2 = 0 + 9x2
9x2 = 9x2

Add '-9x2' to each side of the equation.
9x2 + -9x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
0 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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