12=a+8+5

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Solution for 12=a+8+5 equation:


Simplifying
12 = a + 8 + 5

Reorder the terms:
12 = 8 + 5 + a

Combine like terms: 8 + 5 = 13
12 = 13 + a

Solving
12 = 13 + 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 + -1a = 13 + a + -1a

Combine like terms: a + -1a = 0
12 + -1a = 13 + 0
12 + -1a = 13

Add '-12' to each side of the equation.
12 + -12 + -1a = 13 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = 13 + -12
-1a = 13 + -12

Combine like terms: 13 + -12 = 1
-1a = 1

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

Simplifying
a = -1

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