20-(8+a)-(a-1)=29

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Solution for 20-(8+a)-(a-1)=29 equation:


Simplifying
20 + -1(8 + a) + -1(a + -1) = 29
20 + (8 * -1 + a * -1) + -1(a + -1) = 29
20 + (-8 + -1a) + -1(a + -1) = 29

Reorder the terms:
20 + -8 + -1a + -1(-1 + a) = 29
20 + -8 + -1a + (-1 * -1 + a * -1) = 29
20 + -8 + -1a + (1 + -1a) = 29

Reorder the terms:
20 + -8 + 1 + -1a + -1a = 29

Combine like terms: 20 + -8 = 12
12 + 1 + -1a + -1a = 29

Combine like terms: 12 + 1 = 13
13 + -1a + -1a = 29

Combine like terms: -1a + -1a = -2a
13 + -2a = 29

Solving
13 + -2a = 29

Solving for variable 'a'.

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

Add '-13' to each side of the equation.
13 + -13 + -2a = 29 + -13

Combine like terms: 13 + -13 = 0
0 + -2a = 29 + -13
-2a = 29 + -13

Combine like terms: 29 + -13 = 16
-2a = 16

Divide each side by '-2'.
a = -8

Simplifying
a = -8

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