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

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


Simplifying
-18 = -7 + -2a + a + -12

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

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

Combine like terms: -2a + a = -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 'a' to each side of the equation.
-18 + a = -19 + -1a + a

Combine like terms: -1a + a = 0
-18 + a = -19 + 0
-18 + a = -19

Add '18' to each side of the equation.
-18 + 18 + a = -19 + 18

Combine like terms: -18 + 18 = 0
0 + a = -19 + 18
a = -19 + 18

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

Simplifying
a = -1

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