3x+4y-9y=3x+4y-9y

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Solution for 3x+4y-9y=3x+4y-9y equation: 


Simplifying
3x + 4y + -9y = 3x + 4y + -9y

Combine like terms: 4y + -9y = -5y
3x + -5y = 3x + 4y + -9y

Combine like terms: 4y + -9y = -5y
3x + -5y = 3x + -5y

Add '-3x' to each side of the equation.
3x + -3x + -5y = 3x + -3x + -5y

Combine like terms: 3x + -3x = 0
0 + -5y = 3x + -3x + -5y
-5y = 3x + -3x + -5y

Combine like terms: 3x + -3x = 0
-5y = 0 + -5y
-5y = -5y

Add '5y' to each side of the equation.
-5y + 5y = -5y + 5y

Combine like terms: -5y + 5y = 0
0 = -5y + 5y

Combine like terms: -5y + 5y = 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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