36-12a=-21a-9

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Solution for 36-12a=-21a-9 equation:


Simplifying
36 + -12a = -21a + -9

Reorder the terms:
36 + -12a = -9 + -21a

Solving
36 + -12a = -9 + -21a

Solving for variable 'a'.

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

Add '21a' to each side of the equation.
36 + -12a + 21a = -9 + -21a + 21a

Combine like terms: -12a + 21a = 9a
36 + 9a = -9 + -21a + 21a

Combine like terms: -21a + 21a = 0
36 + 9a = -9 + 0
36 + 9a = -9

Add '-36' to each side of the equation.
36 + -36 + 9a = -9 + -36

Combine like terms: 36 + -36 = 0
0 + 9a = -9 + -36
9a = -9 + -36

Combine like terms: -9 + -36 = -45
9a = -45

Divide each side by '9'.
a = -5

Simplifying
a = -5

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