-21-3x=42

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Solution for -21-3x=42 equation: 


Simplifying
-21 + -3x = 42

Solving
-21 + -3x = 42

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 = 42 + 21

Combine like terms: -21 + 21 = 0
0 + -3x = 42 + 21
-3x = 42 + 21

Combine like terms: 42 + 21 = 63
-3x = 63

Divide each side by '-3'.
x = -21

Simplifying
x = -21

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