8a+12=4a-9

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Solution for 8a+12=4a-9 equation: 


Simplifying
8a + 12 = 4a + -9

Reorder the terms:
12 + 8a = 4a + -9

Reorder the terms:
12 + 8a = -9 + 4a

Solving
12 + 8a = -9 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
12 + 8a + -4a = -9 + 4a + -4a

Combine like terms: 8a + -4a = 4a
12 + 4a = -9 + 4a + -4a

Combine like terms: 4a + -4a = 0
12 + 4a = -9 + 0
12 + 4a = -9

Add '-12' to each side of the equation.
12 + -12 + 4a = -9 + -12

Combine like terms: 12 + -12 = 0
0 + 4a = -9 + -12
4a = -9 + -12

Combine like terms: -9 + -12 = -21
4a = -21

Divide each side by '4'.
a = -5.25

Simplifying
a = -5.25

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