91-I=72

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Solution for 91-I=72 equation: 


Simplifying
91 + -1I = 72

Solving
91 + -1I = 72

Solving for variable 'I'.

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

Add '-91' to each side of the equation.
91 + -91 + -1I = 72 + -91

Combine like terms: 91 + -91 = 0
0 + -1I = 72 + -91
-1I = 72 + -91

Combine like terms: 72 + -91 = -19
-1I = -19

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

Simplifying
I = 19

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