8+9+12+c=20

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Solution for 8+9+12+c=20 equation: 


Simplifying
8 + 9 + 12 + c = 20

Combine like terms: 8 + 9 = 17
17 + 12 + c = 20

Combine like terms: 17 + 12 = 29
29 + c = 20

Solving
29 + c = 20

Solving for variable 'c'.

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

Add '-29' to each side of the equation.
29 + -29 + c = 20 + -29

Combine like terms: 29 + -29 = 0
0 + c = 20 + -29
c = 20 + -29

Combine like terms: 20 + -29 = -9
c = -9

Simplifying
c = -9

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