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x in (-oo:+oo)
1.3 = x/(-2) // - x/(-2)
1.3-(x/(-2)) = 0
1/2*x+1.3 = 0 // - 1.3
1/2*x = -1.3 // : 1/2
x = -1.3/1/2
x = -2.6
x = -2.6
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