x+42=21

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Solution for x+42=21 equation: 


Simplifying
x + 42 = 21

Reorder the terms:
42 + x = 21

Solving
42 + x = 21

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 + x = 21 + -42

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

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

Simplifying
x = -21

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