-3y+7y=4y

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Solution for -3y+7y=4y equation: 


Simplifying
-3y + 7y = 4y

Combine like terms: -3y + 7y = 4y
4y = 4y

Add '-4y' to each side of the equation.
4y + -4y = 4y + -4y

Combine like terms: 4y + -4y = 0
0 = 4y + -4y

Combine like terms: 4y + -4y = 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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