-12[x+3]=4[x-21]

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


Simplifying
-12[x + 3] = 4[x + -21]

Reorder the terms:
-12[3 + x] = 4[x + -21]
[3 * -12 + x * -12] = 4[x + -21]
[-36 + -12x] = 4[x + -21]

Reorder the terms:
-36 + -12x = 4[-21 + x]
-36 + -12x = [-21 * 4 + x * 4]
-36 + -12x = [-84 + 4x]

Solving
-36 + -12x = -84 + 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.
-36 + -12x + -4x = -84 + 4x + -4x

Combine like terms: -12x + -4x = -16x
-36 + -16x = -84 + 4x + -4x

Combine like terms: 4x + -4x = 0
-36 + -16x = -84 + 0
-36 + -16x = -84

Add '36' to each side of the equation.
-36 + 36 + -16x = -84 + 36

Combine like terms: -36 + 36 = 0
0 + -16x = -84 + 36
-16x = -84 + 36

Combine like terms: -84 + 36 = -48
-16x = -48

Divide each side by '-16'.
x = 3

Simplifying
x = 3

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