12y+21=9y+3y+21

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Solution for 12y+21=9y+3y+21 equation: 


Simplifying
12y + 21 = 9y + 3y + 21

Reorder the terms:
21 + 12y = 9y + 3y + 21

Reorder the terms:
21 + 12y = 21 + 9y + 3y

Combine like terms: 9y + 3y = 12y
21 + 12y = 21 + 12y

Add '-21' to each side of the equation.
21 + -21 + 12y = 21 + -21 + 12y

Combine like terms: 21 + -21 = 0
0 + 12y = 21 + -21 + 12y
12y = 21 + -21 + 12y

Combine like terms: 21 + -21 = 0
12y = 0 + 12y
12y = 12y

Add '-12y' to each side of the equation.
12y + -12y = 12y + -12y

Combine like terms: 12y + -12y = 0
0 = 12y + -12y

Combine like terms: 12y + -12y = 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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