12=a-(-21.4)

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Solution for 12=a-(-21.4) equation:


Simplifying
12 = a + -1(-21.4)

Multiply -1 * -21.4
12 = a + 21.4

Reorder the terms:
12 = 21.4 + a

Solving
12 = 21.4 + 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 = 21.4 + a + -1a

Combine like terms: a + -1a = 0
12 + -1a = 21.4 + 0
12 + -1a = 21.4

Add '-12' to each side of the equation.
12 + -12 + -1a = 21.4 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = 21.4 + -12
-1a = 21.4 + -12

Combine like terms: 21.4 + -12 = 9.4
-1a = 9.4

Divide each side by '-1'.
a = -9.4

Simplifying
a = -9.4

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