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x in (-oo:+oo)
1-((1/2)*x) = 17/12 // - 17/12
1-((1/2)*x)-(17/12) = 0
(-1/2)*x-17/12+1 = 0
-1/2*x-5/12 = 0 // + 5/12
-1/2*x = 5/12 // : -1/2
x = 5/12/(-1/2)
x = -5/6
x = -5/6
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