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a in (-oo:+oo)
0.9/1.5 = a/10 // - a/10
0.9/1.5-(a/10) = 0
0.6-1/10*a = 0 // - 0.6
-1/10*a = -0.6 // : -1/10
a = -0.6/(-1/10)
a = 6
a = 6
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