1=-(a-4)

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Solution for 1=-(a-4) equation:


Simplifying
1 = -1(a + -4)

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

Solving
1 = 4 + -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.
1 + a = 4 + -1a + a

Combine like terms: -1a + a = 0
1 + a = 4 + 0
1 + a = 4

Add '-1' to each side of the equation.
1 + -1 + a = 4 + -1

Combine like terms: 1 + -1 = 0
0 + a = 4 + -1
a = 4 + -1

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

Simplifying
a = 3

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