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a in (-oo:+oo)
45 = 5*(1/3)*a // - 5*(1/3)*a
45-(5*(1/3)*a) = 0
(-5/3)*a+45 = 0
45-5/3*a = 0 // - 45
-5/3*a = -45 // : -5/3
a = -45/(-5/3)
a = 27
a = 27
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