12+3(x-4)-21=[5-4(4-x)]

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Solution for 12+3(x-4)-21=[5-4(4-x)] equation:


Simplifying
12 + 3(x + -4) + -21 = [5 + -4(4 + -1x)]

Reorder the terms:
12 + 3(-4 + x) + -21 = [5 + -4(4 + -1x)]
12 + (-4 * 3 + x * 3) + -21 = [5 + -4(4 + -1x)]
12 + (-12 + 3x) + -21 = [5 + -4(4 + -1x)]

Reorder the terms:
12 + -12 + -21 + 3x = [5 + -4(4 + -1x)]

Combine like terms: 12 + -12 = 0
0 + -21 + 3x = [5 + -4(4 + -1x)]
-21 + 3x = [5 + -4(4 + -1x)]
-21 + 3x = [5 + (4 * -4 + -1x * -4)]
-21 + 3x = [5 + (-16 + 4x)]

Combine like terms: 5 + -16 = -11
-21 + 3x = [-11 + 4x]

Remove brackets around [-11 + 4x]
-21 + 3x = -11 + 4x

Solving
-21 + 3x = -11 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-21 + 3x + -4x = -11 + 4x + -4x

Combine like terms: 3x + -4x = -1x
-21 + -1x = -11 + 4x + -4x

Combine like terms: 4x + -4x = 0
-21 + -1x = -11 + 0
-21 + -1x = -11

Add '21' to each side of the equation.
-21 + 21 + -1x = -11 + 21

Combine like terms: -21 + 21 = 0
0 + -1x = -11 + 21
-1x = -11 + 21

Combine like terms: -11 + 21 = 10
-1x = 10

Divide each side by '-1'.
x = -10

Simplifying
x = -10

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