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a in (-oo:+oo)
(1.4*a)/3.6 = -a-0.5 // + -a-0.5
(1.4*a)/3.6+a+0.5 = 0
1.38888889*a+0.5 = 0 // - 0.5
1.38888889*a = -0.5 // : 1.38888889
a = -0.5/1.38888889
a = -0.36
a = -0.36
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