-11a=-12a-21

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Solution for -11a=-12a-21 equation: 


Simplifying
-11a = -12a + -21

Reorder the terms:
-11a = -21 + -12a

Solving
-11a = -21 + -12a

Solving for variable 'a'.

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

Add '12a' to each side of the equation.
-11a + 12a = -21 + -12a + 12a

Combine like terms: -11a + 12a = 1a
1a = -21 + -12a + 12a

Combine like terms: -12a + 12a = 0
1a = -21 + 0
1a = -21

Divide each side by '1'.
a = -21

Simplifying
a = -21

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