18=3-(c+6)

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Solution for 18=3-(c+6) equation:


Simplifying
18 = 3 + -1(c + 6)

Reorder the terms:
18 = 3 + -1(6 + c)
18 = 3 + (6 * -1 + c * -1)
18 = 3 + (-6 + -1c)

Combine like terms: 3 + -6 = -3
18 = -3 + -1c

Solving
18 = -3 + -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.
18 + c = -3 + -1c + c

Combine like terms: -1c + c = 0
18 + c = -3 + 0
18 + c = -3

Add '-18' to each side of the equation.
18 + -18 + c = -3 + -18

Combine like terms: 18 + -18 = 0
0 + c = -3 + -18
c = -3 + -18

Combine like terms: -3 + -18 = -21
c = -21

Simplifying
c = -21

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