-3x-21=-81

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Solution for -3x-21=-81 equation: 


Simplifying
-3x + -21 = -81

Reorder the terms:
-21 + -3x = -81

Solving
-21 + -3x = -81

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + -3x = -81 + 21

Combine like terms: -21 + 21 = 0
0 + -3x = -81 + 21
-3x = -81 + 21

Combine like terms: -81 + 21 = -60
-3x = -60

Divide each side by '-3'.
x = 20

Simplifying
x = 20

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