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

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


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

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

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

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

Remove parenthesis around (4x)
-21 + 3x = 5[5 + -4 * 4x]

Multiply -4 * 4
-21 + 3x = 5[5 + -16x]
-21 + 3x = [5 * 5 + -16x * 5]
-21 + 3x = [25 + -80x]

Solving
-21 + 3x = 25 + -80x

Solving for variable 'x'.

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

Add '80x' to each side of the equation.
-21 + 3x + 80x = 25 + -80x + 80x

Combine like terms: 3x + 80x = 83x
-21 + 83x = 25 + -80x + 80x

Combine like terms: -80x + 80x = 0
-21 + 83x = 25 + 0
-21 + 83x = 25

Add '21' to each side of the equation.
-21 + 21 + 83x = 25 + 21

Combine like terms: -21 + 21 = 0
0 + 83x = 25 + 21
83x = 25 + 21

Combine like terms: 25 + 21 = 46
83x = 46

Divide each side by '83'.
x = 0.5542168675

Simplifying
x = 0.5542168675

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