21=-3(4-x)

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


Simplifying
21 = -3(4 + -1x)
21 = (4 * -3 + -1x * -3)
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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