7-c=-20

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Solution for 7-c=-20 equation: 


Simplifying
7 + -1c = -20

Solving
7 + -1c = -20

Solving for variable 'c'.

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

Add '-7' to each side of the equation.
7 + -7 + -1c = -20 + -7

Combine like terms: 7 + -7 = 0
0 + -1c = -20 + -7
-1c = -20 + -7

Combine like terms: -20 + -7 = -27
-1c = -27

Divide each side by '-1'.
c = 27

Simplifying
c = 27

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