3[4(x-2)+x]=21

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Solution for 3[4(x-2)+x]=21 equation:


Simplifying
3[4(x + -2) + x] = 21

Reorder the terms:
3[4(-2 + x) + x] = 21
3[(-2 * 4 + x * 4) + x] = 21
3[(-8 + 4x) + x] = 21

Combine like terms: 4x + x = 5x
3[-8 + 5x] = 21
[-8 * 3 + 5x * 3] = 21
[-24 + 15x] = 21

Solving
-24 + 15x = 21

Solving for variable 'x'.

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

Add '24' to each side of the equation.
-24 + 24 + 15x = 21 + 24

Combine like terms: -24 + 24 = 0
0 + 15x = 21 + 24
15x = 21 + 24

Combine like terms: 21 + 24 = 45
15x = 45

Divide each side by '15'.
x = 3

Simplifying
x = 3

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