13-2(a-1)=12+9

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Solution for 13-2(a-1)=12+9 equation:


Simplifying
13 + -2(a + -1) = 12 + 9

Reorder the terms:
13 + -2(-1 + a) = 12 + 9
13 + (-1 * -2 + a * -2) = 12 + 9
13 + (2 + -2a) = 12 + 9

Combine like terms: 13 + 2 = 15
15 + -2a = 12 + 9

Combine like terms: 12 + 9 = 21
15 + -2a = 21

Solving
15 + -2a = 21

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + -2a = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -2a = 21 + -15
-2a = 21 + -15

Combine like terms: 21 + -15 = 6
-2a = 6

Divide each side by '-2'.
a = -3

Simplifying
a = -3

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