c+d=30

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Solution for c+d=30 equation: 


Simplifying
c + d = 30

Solving
c + d = 30

Solving for variable 'c'.

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

Add '-1d' to each side of the equation.
c + d + -1d = 30 + -1d

Combine like terms: d + -1d = 0
c + 0 = 30 + -1d
c = 30 + -1d

Simplifying
c = 30 + -1d

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