X-4X-7=21

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


Simplifying
X + -4X + -7 = 21

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

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

Solving
-7 + -3X = 21

Solving for variable 'X'.

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

Add '7' to each side of the equation.
-7 + 7 + -3X = 21 + 7

Combine like terms: -7 + 7 = 0
0 + -3X = 21 + 7
-3X = 21 + 7

Combine like terms: 21 + 7 = 28
-3X = 28

Divide each side by '-3'.
X = -9.333333333

Simplifying
X = -9.333333333

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