28-9a=-12-11a

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Solution for 28-9a=-12-11a equation:


Simplifying
28 + -9a = -12 + -11a

Solving
28 + -9a = -12 + -11a

Solving for variable 'a'.

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

Add '11a' to each side of the equation.
28 + -9a + 11a = -12 + -11a + 11a

Combine like terms: -9a + 11a = 2a
28 + 2a = -12 + -11a + 11a

Combine like terms: -11a + 11a = 0
28 + 2a = -12 + 0
28 + 2a = -12

Add '-28' to each side of the equation.
28 + -28 + 2a = -12 + -28

Combine like terms: 28 + -28 = 0
0 + 2a = -12 + -28
2a = -12 + -28

Combine like terms: -12 + -28 = -40
2a = -40

Divide each side by '2'.
a = -20

Simplifying
a = -20

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