3a+12=4a

Solution for 3a+12=4a equation:

Simplifying
3a + 12 = 4a

Reorder the terms:
12 + 3a = 4a

Solving
12 + 3a = 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 + 3a + -4a = 4a + -4a

Combine like terms: 3a + -4a = -1a
12 + -1a = 4a + -4a

Combine like terms: 4a + -4a = 0
12 + -1a = 0

Add '-12' to each side of the equation.
12 + -12 + -1a = 0 + -12

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

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

Divide each side by '-1'.
a = 12

Simplifying
a = 12