18=a-(-19)

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Solution for 18=a-(-19) equation:


Simplifying
18 = a + -1(-19)

Multiply -1 * -19
18 = a + 19

Reorder the terms:
18 = 19 + a

Solving
18 = 19 + 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.
18 + -1a = 19 + a + -1a

Combine like terms: a + -1a = 0
18 + -1a = 19 + 0
18 + -1a = 19

Add '-18' to each side of the equation.
18 + -18 + -1a = 19 + -18

Combine like terms: 18 + -18 = 0
0 + -1a = 19 + -18
-1a = 19 + -18

Combine like terms: 19 + -18 = 1
-1a = 1

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

Simplifying
a = -1

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