21x-[9-(5x-6)+8x]=15-[(4x-7)-(6x-5)]

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Solution for 21x-[9-(5x-6)+8x]=15-[(4x-7)-(6x-5)] equation:


Simplifying
21x + -1[9 + -1(5x + -6) + 8x] = 15 + -1[(4x + -7) + -1(6x + -5)]

Reorder the terms:
21x + -1[9 + -1(-6 + 5x) + 8x] = 15 + -1[(4x + -7) + -1(6x + -5)]
21x + -1[9 + (-6 * -1 + 5x * -1) + 8x] = 15 + -1[(4x + -7) + -1(6x + -5)]
21x + -1[9 + (6 + -5x) + 8x] = 15 + -1[(4x + -7) + -1(6x + -5)]

Combine like terms: 9 + 6 = 15
21x + -1[15 + -5x + 8x] = 15 + -1[(4x + -7) + -1(6x + -5)]

Combine like terms: -5x + 8x = 3x
21x + -1[15 + 3x] = 15 + -1[(4x + -7) + -1(6x + -5)]
21x + [15 * -1 + 3x * -1] = 15 + -1[(4x + -7) + -1(6x + -5)]
21x + [-15 + -3x] = 15 + -1[(4x + -7) + -1(6x + -5)]

Reorder the terms:
-15 + 21x + -3x = 15 + -1[(4x + -7) + -1(6x + -5)]

Combine like terms: 21x + -3x = 18x
-15 + 18x = 15 + -1[(4x + -7) + -1(6x + -5)]

Reorder the terms:
-15 + 18x = 15 + -1[(-7 + 4x) + -1(6x + -5)]

Remove parenthesis around (-7 + 4x)
-15 + 18x = 15 + -1[-7 + 4x + -1(6x + -5)]

Reorder the terms:
-15 + 18x = 15 + -1[-7 + 4x + -1(-5 + 6x)]
-15 + 18x = 15 + -1[-7 + 4x + (-5 * -1 + 6x * -1)]
-15 + 18x = 15 + -1[-7 + 4x + (5 + -6x)]

Reorder the terms:
-15 + 18x = 15 + -1[-7 + 5 + 4x + -6x]

Combine like terms: -7 + 5 = -2
-15 + 18x = 15 + -1[-2 + 4x + -6x]

Combine like terms: 4x + -6x = -2x
-15 + 18x = 15 + -1[-2 + -2x]
-15 + 18x = 15 + [-2 * -1 + -2x * -1]
-15 + 18x = 15 + [2 + 2x]

Combine like terms: 15 + 2 = 17
-15 + 18x = 17 + 2x

Solving
-15 + 18x = 17 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
-15 + 18x + -2x = 17 + 2x + -2x

Combine like terms: 18x + -2x = 16x
-15 + 16x = 17 + 2x + -2x

Combine like terms: 2x + -2x = 0
-15 + 16x = 17 + 0
-15 + 16x = 17

Add '15' to each side of the equation.
-15 + 15 + 16x = 17 + 15

Combine like terms: -15 + 15 = 0
0 + 16x = 17 + 15
16x = 17 + 15

Combine like terms: 17 + 15 = 32
16x = 32

Divide each side by '16'.
x = 2

Simplifying
x = 2

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