30-X=40

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Solution for 30-X=40 equation: 


Simplifying
30 + -1X = 40

Solving
30 + -1X = 40

Solving for variable 'X'.

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

Add '-30' to each side of the equation.
30 + -30 + -1X = 40 + -30

Combine like terms: 30 + -30 = 0
0 + -1X = 40 + -30
-1X = 40 + -30

Combine like terms: 40 + -30 = 10
-1X = 10

Divide each side by '-1'.
X = -10

Simplifying
X = -10

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