21=-6x+3(x-4)

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Solution for 21=-6x+3(x-4) equation:


Simplifying
21 = -6x + 3(x + -4)

Reorder the terms:
21 = -6x + 3(-4 + x)
21 = -6x + (-4 * 3 + x * 3)
21 = -6x + (-12 + 3x)

Reorder the terms:
21 = -12 + -6x + 3x

Combine like terms: -6x + 3x = -3x
21 = -12 + -3x

Solving
21 = -12 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
21 + 3x = -12 + -3x + 3x

Combine like terms: -3x + 3x = 0
21 + 3x = -12 + 0
21 + 3x = -12

Add '-21' to each side of the equation.
21 + -21 + 3x = -12 + -21

Combine like terms: 21 + -21 = 0
0 + 3x = -12 + -21
3x = -12 + -21

Combine like terms: -12 + -21 = -33
3x = -33

Divide each side by '3'.
x = -11

Simplifying
x = -11

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