20=6-(c+7)

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Solution for 20=6-(c+7) equation:


Simplifying
20 = 6 + -1(c + 7)

Reorder the terms:
20 = 6 + -1(7 + c)
20 = 6 + (7 * -1 + c * -1)
20 = 6 + (-7 + -1c)

Combine like terms: 6 + -7 = -1
20 = -1 + -1c

Solving
20 = -1 + -1c

Solving for variable 'c'.

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

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

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

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

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

Combine like terms: -1 + -20 = -21
c = -21

Simplifying
c = -21

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