9*11-c=81

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Solution for 9*11-c=81 equation:


Simplifying
9 * 11 + -1c = 81

Multiply 9 * 11
99 + -1c = 81

Solving
99 + -1c = 81

Solving for variable 'c'.

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

Add '-99' to each side of the equation.
99 + -99 + -1c = 81 + -99

Combine like terms: 99 + -99 = 0
0 + -1c = 81 + -99
-1c = 81 + -99

Combine like terms: 81 + -99 = -18
-1c = -18

Divide each side by '-1'.
c = 18

Simplifying
c = 18

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