12a-6a+21=-45

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Solution for 12a-6a+21=-45 equation:


Simplifying
12a + -6a + 21 = -45

Reorder the terms:
21 + 12a + -6a = -45

Combine like terms: 12a + -6a = 6a
21 + 6a = -45

Solving
21 + 6a = -45

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + 6a = -45 + -21

Combine like terms: 21 + -21 = 0
0 + 6a = -45 + -21
6a = -45 + -21

Combine like terms: -45 + -21 = -66
6a = -66

Divide each side by '6'.
a = -11

Simplifying
a = -11

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