C-(-20)=-11

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Solution for C-(-20)=-11 equation: 


Simplifying
C + -1(-20) = -11

Multiply -1 * -20
C + 20 = -11

Reorder the terms:
20 + C = -11

Solving
20 + C = -11

Solving for variable 'C'.

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

Add '-20' to each side of the equation.
20 + -20 + C = -11 + -20

Combine like terms: 20 + -20 = 0
0 + C = -11 + -20
C = -11 + -20

Combine like terms: -11 + -20 = -31
C = -31

Simplifying
C = -31

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