21=9X+1-4X

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Solution for 21=9X+1-4X equation:


Simplifying
21 = 9X + 1 + -4X

Reorder the terms:
21 = 1 + 9X + -4X

Combine like terms: 9X + -4X = 5X
21 = 1 + 5X

Solving
21 = 1 + 5X

Solving for variable 'X'.

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

Add '-5X' to each side of the equation.
21 + -5X = 1 + 5X + -5X

Combine like terms: 5X + -5X = 0
21 + -5X = 1 + 0
21 + -5X = 1

Add '-21' to each side of the equation.
21 + -21 + -5X = 1 + -21

Combine like terms: 21 + -21 = 0
0 + -5X = 1 + -21
-5X = 1 + -21

Combine like terms: 1 + -21 = -20
-5X = -20

Divide each side by '-5'.
X = 4

Simplifying
X = 4

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