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x in (-oo:+oo)
(-1/2)*x = 17/15 // - 17/15
(-1/2)*x-(17/15) = 0
(-1/2)*x-17/15 = 0
-1/2*x-17/15 = 0 // + 17/15
-1/2*x = 17/15 // : -1/2
x = 17/15/(-1/2)
x = -34/15
x = -34/15
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