11=a-(-18)

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Solution for 11=a-(-18) equation: 


Simplifying
11 = a + -1(-18)

Multiply -1 * -18
11 = a + 18

Reorder the terms:
11 = 18 + a

Solving
11 = 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.
11 + -1a = 18 + a + -1a

Combine like terms: a + -1a = 0
11 + -1a = 18 + 0
11 + -1a = 18

Add '-11' to each side of the equation.
11 + -11 + -1a = 18 + -11

Combine like terms: 11 + -11 = 0
0 + -1a = 18 + -11
-1a = 18 + -11

Combine like terms: 18 + -11 = 7
-1a = 7

Divide each side by '-1'.
a = -7

Simplifying
a = -7

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