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x in (-oo:+oo)
(5/3)*x = (12/5)*a // - (12/5)*a
(5/3)*x-((12/5)*a) = 0
(-12/5)*a+(5/3)*x = 0
5/3*x-12/5*a = 0 // + -12/5*a
5/3*x = -(-12/5*a) // : 5/3
x = (-(-12/5*a))/5/3
x = 36/25*a
x = 36/25*a
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