12a+9=7a-15

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Solution for 12a+9=7a-15 equation:


Simplifying
12a + 9 = 7a + -15

Reorder the terms:
9 + 12a = 7a + -15

Reorder the terms:
9 + 12a = -15 + 7a

Solving
9 + 12a = -15 + 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
9 + 12a + -7a = -15 + 7a + -7a

Combine like terms: 12a + -7a = 5a
9 + 5a = -15 + 7a + -7a

Combine like terms: 7a + -7a = 0
9 + 5a = -15 + 0
9 + 5a = -15

Add '-9' to each side of the equation.
9 + -9 + 5a = -15 + -9

Combine like terms: 9 + -9 = 0
0 + 5a = -15 + -9
5a = -15 + -9

Combine like terms: -15 + -9 = -24
5a = -24

Divide each side by '5'.
a = -4.8

Simplifying
a = -4.8

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