-2x-3=-21

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Solution for -2x-3=-21 equation: 


Simplifying
-2x + -3 = -21

Reorder the terms:
-3 + -2x = -21

Solving
-3 + -2x = -21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + -2x = -21 + 3

Combine like terms: -3 + 3 = 0
0 + -2x = -21 + 3
-2x = -21 + 3

Combine like terms: -21 + 3 = -18
-2x = -18

Divide each side by '-2'.
x = 9

Simplifying
x = 9

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