40-x=21

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Solution for 40-x=21 equation: 


Simplifying
40 + -1x = 21

Solving
40 + -1x = 21

Solving for variable 'x'.

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

Add '-40' to each side of the equation.
40 + -40 + -1x = 21 + -40

Combine like terms: 40 + -40 = 0
0 + -1x = 21 + -40
-1x = 21 + -40

Combine like terms: 21 + -40 = -19
-1x = -19

Divide each side by '-1'.
x = 19

Simplifying
x = 19

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