-1/2(a+12)=4-a

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Solution for -1/2(a+12)=4-a equation: 


a in (-oo:+oo)

(-1/2)*(a+12) = 4-a // - 4-a

(-1/2)*(a+12)+a-4 = 0

a-1/2*(a+12)-4 = 0

a-1/2*(a+12)-4 = 0

1/2*a-6-4 = 0

1/2*a-10 = 0

1/2*a-10 = 0

1/2*a-10 = 0 // + 10

1/2*a = 10 // : 1/2

a = 10/1/2

a = 20

a = 20

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