c+(c-20)+(c-10)=180

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Solution for c+(c-20)+(c-10)=180 equation: 


Simplifying
c + (c + -20) + (c + -10) = 180

Reorder the terms:
c + (-20 + c) + (c + -10) = 180

Remove parenthesis around (-20 + c)
c + -20 + c + (c + -10) = 180

Reorder the terms:
c + -20 + c + (-10 + c) = 180

Remove parenthesis around (-10 + c)
c + -20 + c + -10 + c = 180

Reorder the terms:
-20 + -10 + c + c + c = 180

Combine like terms: -20 + -10 = -30
-30 + c + c + c = 180

Combine like terms: c + c = 2c
-30 + 2c + c = 180

Combine like terms: 2c + c = 3c
-30 + 3c = 180

Solving
-30 + 3c = 180

Solving for variable 'c'.

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

Add '30' to each side of the equation.
-30 + 30 + 3c = 180 + 30

Combine like terms: -30 + 30 = 0
0 + 3c = 180 + 30
3c = 180 + 30

Combine like terms: 180 + 30 = 210
3c = 210

Divide each side by '3'.
c = 70

Simplifying
c = 70

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