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a in (-oo:+oo)
1.5 = (2*a)/3 // - (2*a)/3
1.5-((2*a)/3) = 0
(-2/3)*a+1.5 = 0
1.5-2/3*a = 0 // - 1.5
-2/3*a = -1.5 // : -2/3
a = -1.5/(-2/3)
a = 2.24999999
a = 2.24999999
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