-2a=-21-5a

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Solution for -2a=-21-5a equation: 


Simplifying
-2a = -21 + -5a

Solving
-2a = -21 + -5a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '5a' to each side of the equation.
-2a + 5a = -21 + -5a + 5a

Combine like terms: -2a + 5a = 3a
3a = -21 + -5a + 5a

Combine like terms: -5a + 5a = 0
3a = -21 + 0
3a = -21

Divide each side by '3'.
a = -7

Simplifying
a = -7

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