20=a-(-8)

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Solution for 20=a-(-8) equation:


Simplifying
20 = a + -1(-8)

Multiply -1 * -8
20 = a + 8

Reorder the terms:
20 = 8 + a

Solving
20 = 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.
20 + -1a = 8 + a + -1a

Combine like terms: a + -1a = 0
20 + -1a = 8 + 0
20 + -1a = 8

Add '-20' to each side of the equation.
20 + -20 + -1a = 8 + -20

Combine like terms: 20 + -20 = 0
0 + -1a = 8 + -20
-1a = 8 + -20

Combine like terms: 8 + -20 = -12
-1a = -12

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

Simplifying
a = 12

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