70-X=100

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Solution for 70-X=100 equation: 


Simplifying
70 + -1X = 100

Solving
70 + -1X = 100

Solving for variable 'X'.

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

Add '-70' to each side of the equation.
70 + -70 + -1X = 100 + -70

Combine like terms: 70 + -70 = 0
0 + -1X = 100 + -70
-1X = 100 + -70

Combine like terms: 100 + -70 = 30
-1X = 30

Divide each side by '-1'.
X = -30

Simplifying
X = -30

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