12=a-(-18)

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Solution for 12=a-(-18) equation:


Simplifying
12 = a + -1(-18)

Multiply -1 * -18
12 = a + 18

Reorder the terms:
12 = 18 + a

Solving
12 = 18 + 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 = 18 + a + -1a

Combine like terms: a + -1a = 0
12 + -1a = 18 + 0
12 + -1a = 18

Add '-12' to each side of the equation.
12 + -12 + -1a = 18 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = 18 + -12
-1a = 18 + -12

Combine like terms: 18 + -12 = 6
-1a = 6

Divide each side by '-1'.
a = -6

Simplifying
a = -6

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