-21=-30-3x

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Solution for -21=-30-3x equation: 


Simplifying
-21 = -30 + -3x

Solving
-21 = -30 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-21 + 3x = -30 + -3x + 3x

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

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 = -9
3x = -9

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

Simplifying
x = -3

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