20=2(9+c)

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Solution for 20=2(9+c) equation:


Simplifying
20 = 2(9 + c)
20 = (9 * 2 + c * 2)
20 = (18 + 2c)

Solving
20 = 18 + 2c

Solving for variable 'c'.

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

Add '-2c' to each side of the equation.
20 + -2c = 18 + 2c + -2c

Combine like terms: 2c + -2c = 0
20 + -2c = 18 + 0
20 + -2c = 18

Add '-20' to each side of the equation.
20 + -20 + -2c = 18 + -20

Combine like terms: 20 + -20 = 0
0 + -2c = 18 + -20
-2c = 18 + -20

Combine like terms: 18 + -20 = -2
-2c = -2

Divide each side by '-2'.
c = 1

Simplifying
c = 1

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