81-63-6=18+2a+18

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Solution for 81-63-6=18+2a+18 equation:


Simplifying
81 + -63 + -6 = 18 + 2a + 18

Combine like terms: 81 + -63 = 18
18 + -6 = 18 + 2a + 18

Combine like terms: 18 + -6 = 12
12 = 18 + 2a + 18

Reorder the terms:
12 = 18 + 18 + 2a

Combine like terms: 18 + 18 = 36
12 = 36 + 2a

Solving
12 = 36 + 2a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-2a' to each side of the equation.
12 + -2a = 36 + 2a + -2a

Combine like terms: 2a + -2a = 0
12 + -2a = 36 + 0
12 + -2a = 36

Add '-12' to each side of the equation.
12 + -12 + -2a = 36 + -12

Combine like terms: 12 + -12 = 0
0 + -2a = 36 + -12
-2a = 36 + -12

Combine like terms: 36 + -12 = 24
-2a = 24

Divide each side by '-2'.
a = -12

Simplifying
a = -12

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