4(x-3)-x=-21

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


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

Reorder the terms:
4(-3 + x) + -1x = -21
(-3 * 4 + x * 4) + -1x = -21
(-12 + 4x) + -1x = -21

Combine like terms: 4x + -1x = 3x
-12 + 3x = -21

Solving
-12 + 3x = -21

Solving for variable 'x'.

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

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

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

Combine like terms: -21 + 12 = -9
3x = -9

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

Simplifying
x = -3

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