A-(4a-7)=5a-(a+21)

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Solution for A-(4a-7)=5a-(a+21) equation:


Simplifying
A + -1(4a + -7) = 5a + -1(a + 21)

Reorder the terms:
A + -1(-7 + 4a) = 5a + -1(a + 21)
A + (-7 * -1 + 4a * -1) = 5a + -1(a + 21)
A + (7 + -4a) = 5a + -1(a + 21)

Reorder the terms:
7 + A + -4a = 5a + -1(a + 21)

Reorder the terms:
7 + A + -4a = 5a + -1(21 + a)
7 + A + -4a = 5a + (21 * -1 + a * -1)
7 + A + -4a = 5a + (-21 + -1a)

Reorder the terms:
7 + A + -4a = -21 + 5a + -1a

Combine like terms: 5a + -1a = 4a
7 + A + -4a = -21 + 4a

Solving
7 + A + -4a = -21 + 4a

Solving for variable 'A'.

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

Add '-7' to each side of the equation.
7 + A + -7 + -4a = -21 + -7 + 4a

Reorder the terms:
7 + -7 + A + -4a = -21 + -7 + 4a

Combine like terms: 7 + -7 = 0
0 + A + -4a = -21 + -7 + 4a
A + -4a = -21 + -7 + 4a

Combine like terms: -21 + -7 = -28
A + -4a = -28 + 4a

Add '4a' to each side of the equation.
A + -4a + 4a = -28 + 4a + 4a

Combine like terms: -4a + 4a = 0
A + 0 = -28 + 4a + 4a
A = -28 + 4a + 4a

Combine like terms: 4a + 4a = 8a
A = -28 + 8a

Simplifying
A = -28 + 8a

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