21=7X-4X-9

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Solution for 21=7X-4X-9 equation: 


Simplifying
21 = 7X + -4X + -9

Reorder the terms:
21 = -9 + 7X + -4X

Combine like terms: 7X + -4X = 3X
21 = -9 + 3X

Solving
21 = -9 + 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 = -9 + 3X + -3X

Combine like terms: 3X + -3X = 0
21 + -3X = -9 + 0
21 + -3X = -9

Add '-21' to each side of the equation.
21 + -21 + -3X = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -3X = -9 + -21
-3X = -9 + -21

Combine like terms: -9 + -21 = -30
-3X = -30

Divide each side by '-3'.
X = 10

Simplifying
X = 10

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