90=-9c-c

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Solution for 90=-9c-c equation:


Simplifying
90 = -9c + -1c

Combine like terms: -9c + -1c = -10c
90 = -10c

Solving
90 = -10c

Solving for variable 'c'.

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

Add '10c' to each side of the equation.
90 + 10c = -10c + 10c

Combine like terms: -10c + 10c = 0
90 + 10c = 0

Add '-90' to each side of the equation.
90 + -90 + 10c = 0 + -90

Combine like terms: 90 + -90 = 0
0 + 10c = 0 + -90
10c = 0 + -90

Combine like terms: 0 + -90 = -90
10c = -90

Divide each side by '10'.
c = -9

Simplifying
c = -9

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