4a+12=7a-9

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Solution for 4a+12=7a-9 equation:


Simplifying
4a + 12 = 7a + -9

Reorder the terms:
12 + 4a = 7a + -9

Reorder the terms:
12 + 4a = -9 + 7a

Solving
12 + 4a = -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 + 4a + -7a = -9 + 7a + -7a

Combine like terms: 4a + -7a = -3a
12 + -3a = -9 + 7a + -7a

Combine like terms: 7a + -7a = 0
12 + -3a = -9 + 0
12 + -3a = -9

Add '-12' to each side of the equation.
12 + -12 + -3a = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -3a = -9 + -12
-3a = -9 + -12

Combine like terms: -9 + -12 = -21
-3a = -21

Divide each side by '-3'.
a = 7

Simplifying
a = 7

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