12=a-3.8

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Solution for 12=a-3.8 equation:


Simplifying
12 = a + -3.8

Reorder the terms:
12 = -3.8 + a

Solving
12 = -3.8 + 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 + -1a = -3.8 + a + -1a

Combine like terms: a + -1a = 0
12 + -1a = -3.8 + 0
12 + -1a = -3.8

Add '-12' to each side of the equation.
12 + -12 + -1a = -3.8 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = -3.8 + -12
-1a = -3.8 + -12

Combine like terms: -3.8 + -12 = -15.8
-1a = -15.8

Divide each side by '-1'.
a = 15.8

Simplifying
a = 15.8

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