9a+12=7a+9

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


Simplifying
9a + 12 = 7a + 9

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

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

Solving
12 + 9a = 9 + 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.
12 + 9a + -7a = 9 + 7a + -7a

Combine like terms: 9a + -7a = 2a
12 + 2a = 9 + 7a + -7a

Combine like terms: 7a + -7a = 0
12 + 2a = 9 + 0
12 + 2a = 9

Add '-12' to each side of the equation.
12 + -12 + 2a = 9 + -12

Combine like terms: 12 + -12 = 0
0 + 2a = 9 + -12
2a = 9 + -12

Combine like terms: 9 + -12 = -3
2a = -3

Divide each side by '2'.
a = -1.5

Simplifying
a = -1.5

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