-1/2(c-9)=2

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Solution for -1/2(c-9)=2 equation: 


c in (-oo:+oo)

(-1/2)*(c-9) = 2 // - 2

(-1/2)*(c-9)-2 = 0

-1/2*(c-9)-2 = 0

-1/2*(c-9)-2 = 0

5/2-1/2*c = 0

5/2-1/2*c = 0

5/2-1/2*c = 0 // - 5/2

-1/2*c = -5/2 // : -1/2

c = -5/2/(-1/2)

c = 5

c = 5

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