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

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


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

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

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

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

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

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

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

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

Combine like terms: 21x + -21x = 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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