80-c=91

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Solution for 80-c=91 equation: 


Simplifying
80 + -1c = 91

Solving
80 + -1c = 91

Solving for variable 'c'.

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

Add '-80' to each side of the equation.
80 + -80 + -1c = 91 + -80

Combine like terms: 80 + -80 = 0
0 + -1c = 91 + -80
-1c = 91 + -80

Combine like terms: 91 + -80 = 11
-1c = 11

Divide each side by '-1'.
c = -11

Simplifying
c = -11

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