-21-x-2x=30

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Solution for -21-x-2x=30 equation: 


Simplifying
-21 + -1x + -2x = 30

Combine like terms: -1x + -2x = -3x
-21 + -3x = 30

Solving
-21 + -3x = 30

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 = 30 + 21

Combine like terms: -21 + 21 = 0
0 + -3x = 30 + 21
-3x = 30 + 21

Combine like terms: 30 + 21 = 51
-3x = 51

Divide each side by '-3'.
x = -17

Simplifying
x = -17

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