21x+42=-378

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Solution for 21x+42=-378 equation: 


Simplifying
21x + 42 = -378

Reorder the terms:
42 + 21x = -378

Solving
42 + 21x = -378

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + 21x = -378 + -42

Combine like terms: 42 + -42 = 0
0 + 21x = -378 + -42
21x = -378 + -42

Combine like terms: -378 + -42 = -420
21x = -420

Divide each side by '21'.
x = -20

Simplifying
x = -20

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