20=4-(a+7)

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Solution for 20=4-(a+7) equation:


Simplifying
20 = 4 + -1(a + 7)

Reorder the terms:
20 = 4 + -1(7 + a)
20 = 4 + (7 * -1 + a * -1)
20 = 4 + (-7 + -1a)

Combine like terms: 4 + -7 = -3
20 = -3 + -1a

Solving
20 = -3 + -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.
20 + a = -3 + -1a + a

Combine like terms: -1a + a = 0
20 + a = -3 + 0
20 + a = -3

Add '-20' to each side of the equation.
20 + -20 + a = -3 + -20

Combine like terms: 20 + -20 = 0
0 + a = -3 + -20
a = -3 + -20

Combine like terms: -3 + -20 = -23
a = -23

Simplifying
a = -23

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