2x-4=-21

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Solution for 2x-4=-21 equation: 


Simplifying
2x + -4 = -21

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

Solving
-4 + 2x = -21

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 2x = -21 + 4

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

Combine like terms: -21 + 4 = -17
2x = -17

Divide each side by '2'.
x = -8.5

Simplifying
x = -8.5

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