1/2-1/2a=13/18

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Solution for 1/2-1/2a=13/18 equation: 


a in (-oo:+oo)

1/2-((1/2)*a) = 13/18 // - 13/18

1/2-((1/2)*a)-(13/18) = 0

(-1/2)*a+1/2-13/18 = 0

-1/2*a-2/9 = 0 // + 2/9

-1/2*a = 2/9 // : -1/2

a = 2/9/(-1/2)

a = -4/9

a = -4/9

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