a-4a=2a+-5a

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Solution for a-4a=2a+-5a equation: 


Simplifying
a + -4a = 2a + -5a

Combine like terms: a + -4a = -3a
-3a = 2a + -5a

Combine like terms: 2a + -5a = -3a
-3a = -3a

Add '3a' to each side of the equation.
-3a + 3a = -3a + 3a

Combine like terms: -3a + 3a = 0
0 = -3a + 3a

Combine like terms: -3a + 3a = 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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