-1/2(a-1)=2

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Solution for -1/2(a-1)=2 equation: 


a in (-oo:+oo)

(-1/2)*(a-1) = 2 // - 2

(-1/2)*(a-1)-2 = 0

-1/2*(a-1)-2 = 0

-1/2*(a-1)-2 = 0

-1/2*a-3/2 = 0

-1/2*a-3/2 = 0

-1/2*a-3/2 = 0 // + 3/2

-1/2*a = 3/2 // : -1/2

a = 3/2/(-1/2)

a = -3

a = -3

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