100-20-X=5

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Solution for 100-20-X=5 equation: 


Simplifying
100 + -20 + -1X = 5

Combine like terms: 100 + -20 = 80
80 + -1X = 5

Solving
80 + -1X = 5

Solving for variable 'X'.

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

Add '-80' to each side of the equation.
80 + -80 + -1X = 5 + -80

Combine like terms: 80 + -80 = 0
0 + -1X = 5 + -80
-1X = 5 + -80

Combine like terms: 5 + -80 = -75
-1X = -75

Divide each side by '-1'.
X = 75

Simplifying
X = 75

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