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a in (-oo:+oo)
1.5 = a/3 // - a/3
1.5-(a/3) = 0
1.5-1/3*a = 0 // - 1.5
-1/3*a = -1.5 // : -1/3
a = -1.5/(-1/3)
a = 4.50000005
a = 4.50000005
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