91=c-(-12)

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Solution for 91=c-(-12) equation:


Simplifying
91 = c + -1(-12)

Multiply -1 * -12
91 = c + 12

Reorder the terms:
91 = 12 + c

Solving
91 = 12 + c

Solving for variable 'c'.

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

Add '-1c' to each side of the equation.
91 + -1c = 12 + c + -1c

Combine like terms: c + -1c = 0
91 + -1c = 12 + 0
91 + -1c = 12

Add '-91' to each side of the equation.
91 + -91 + -1c = 12 + -91

Combine like terms: 91 + -91 = 0
0 + -1c = 12 + -91
-1c = 12 + -91

Combine like terms: 12 + -91 = -79
-1c = -79

Divide each side by '-1'.
c = 79

Simplifying
c = 79

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