-18=-(7-2a)-(9+12)

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Solution for -18=-(7-2a)-(9+12) equation:


Simplifying
-18 = -1(7 + -2a) + -1(9 + 12)
-18 = (7 * -1 + -2a * -1) + -1(9 + 12)
-18 = (-7 + 2a) + -1(9 + 12)

Combine like terms: 9 + 12 = 21
-18 = -7 + 2a + -1(21)

Multiply -1 * 21
-18 = -7 + 2a + -21

Reorder the terms:
-18 = -7 + -21 + 2a

Combine like terms: -7 + -21 = -28
-18 = -28 + 2a

Solving
-18 = -28 + 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.
-18 + -2a = -28 + 2a + -2a

Combine like terms: 2a + -2a = 0
-18 + -2a = -28 + 0
-18 + -2a = -28

Add '18' to each side of the equation.
-18 + 18 + -2a = -28 + 18

Combine like terms: -18 + 18 = 0
0 + -2a = -28 + 18
-2a = -28 + 18

Combine like terms: -28 + 18 = -10
-2a = -10

Divide each side by '-2'.
a = 5

Simplifying
a = 5

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