3x-(5x-21)=6x+(9-4x)

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Solution for 3x-(5x-21)=6x+(9-4x) equation:


Simplifying
3x + -1(5x + -21) = 6x + (9 + -4x)

Reorder the terms:
3x + -1(-21 + 5x) = 6x + (9 + -4x)
3x + (-21 * -1 + 5x * -1) = 6x + (9 + -4x)
3x + (21 + -5x) = 6x + (9 + -4x)

Reorder the terms:
21 + 3x + -5x = 6x + (9 + -4x)

Combine like terms: 3x + -5x = -2x
21 + -2x = 6x + (9 + -4x)

Remove parenthesis around (9 + -4x)
21 + -2x = 6x + 9 + -4x

Reorder the terms:
21 + -2x = 9 + 6x + -4x

Combine like terms: 6x + -4x = 2x
21 + -2x = 9 + 2x

Solving
21 + -2x = 9 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
21 + -2x + -2x = 9 + 2x + -2x

Combine like terms: -2x + -2x = -4x
21 + -4x = 9 + 2x + -2x

Combine like terms: 2x + -2x = 0
21 + -4x = 9 + 0
21 + -4x = 9

Add '-21' to each side of the equation.
21 + -21 + -4x = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -4x = 9 + -21
-4x = 9 + -21

Combine like terms: 9 + -21 = -12
-4x = -12

Divide each side by '-4'.
x = 3

Simplifying
x = 3

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