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

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


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

Reorder the terms:
-18 = -7 + 2a + -1(12 + a)
-18 = -7 + 2a + (12 * -1 + a * -1)
-18 = -7 + 2a + (-12 + -1a)

Reorder the terms:
-18 = -7 + -12 + 2a + -1a

Combine like terms: -7 + -12 = -19
-18 = -19 + 2a + -1a

Combine like terms: 2a + -1a = 1a
-18 = -19 + 1a

Solving
-18 = -19 + 1a

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 + 1a + -1a

Combine like terms: 1a + -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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