3x-21=-42

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Solution for 3x-21=-42 equation: 


Simplifying
3x + -21 = -42

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

Divide each side by '3'.
x = -7

Simplifying
x = -7

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