4X-(21-21X)-9=

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Solution for 4X-(21-21X)-9= equation:


Simplifying
4X + -1(21 + -21X) + -9 = 0
4X + (21 * -1 + -21X * -1) + -9 = 0
4X + (-21 + 21X) + -9 = 0

Reorder the terms:
-21 + -9 + 4X + 21X = 0

Combine like terms: -21 + -9 = -30
-30 + 4X + 21X = 0

Combine like terms: 4X + 21X = 25X
-30 + 25X = 0

Solving
-30 + 25X = 0

Solving for variable 'X'.

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

Add '30' to each side of the equation.
-30 + 30 + 25X = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 25X = 0 + 30
25X = 0 + 30

Combine like terms: 0 + 30 = 30
25X = 30

Divide each side by '25'.
X = 1.2

Simplifying
X = 1.2

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