7a-12=8a+9

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Solution for 7a-12=8a+9 equation:


Simplifying
7a + -12 = 8a + 9

Reorder the terms:
-12 + 7a = 8a + 9

Reorder the terms:
-12 + 7a = 9 + 8a

Solving
-12 + 7a = 9 + 8a

Solving for variable 'a'.

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

Add '-8a' to each side of the equation.
-12 + 7a + -8a = 9 + 8a + -8a

Combine like terms: 7a + -8a = -1a
-12 + -1a = 9 + 8a + -8a

Combine like terms: 8a + -8a = 0
-12 + -1a = 9 + 0
-12 + -1a = 9

Add '12' to each side of the equation.
-12 + 12 + -1a = 9 + 12

Combine like terms: -12 + 12 = 0
0 + -1a = 9 + 12
-1a = 9 + 12

Combine like terms: 9 + 12 = 21
-1a = 21

Divide each side by '-1'.
a = -21

Simplifying
a = -21

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