3a+12=8+a

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Solution for 3a+12=8+a equation:


Simplifying
3a + 12 = 8 + a

Reorder the terms:
12 + 3a = 8 + a

Solving
12 + 3a = 8 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
12 + 3a + -1a = 8 + a + -1a

Combine like terms: 3a + -1a = 2a
12 + 2a = 8 + a + -1a

Combine like terms: a + -1a = 0
12 + 2a = 8 + 0
12 + 2a = 8

Add '-12' to each side of the equation.
12 + -12 + 2a = 8 + -12

Combine like terms: 12 + -12 = 0
0 + 2a = 8 + -12
2a = 8 + -12

Combine like terms: 8 + -12 = -4
2a = -4

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

Simplifying
a = -2

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