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a in (-oo:+oo)
0.6 = a/(-2) // - a/(-2)
0.6-(a/(-2)) = 0
1/2*a+0.6 = 0 // - 0.6
1/2*a = -0.6 // : 1/2
a = -0.6/1/2
a = -1.2
a = -1.2
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