40-X=100

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Solution for 40-X=100 equation: 


Simplifying
40 + -1X = 100

Solving
40 + -1X = 100

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 = 100 + -40

Combine like terms: 40 + -40 = 0
0 + -1X = 100 + -40
-1X = 100 + -40

Combine like terms: 100 + -40 = 60
-1X = 60

Divide each side by '-1'.
X = -60

Simplifying
X = -60

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