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a in (-oo:+oo)
(3/5)*a-10 = -53/5 // + -53/5
(3/5)*a-(-53/5)-10 = 0
(3/5)*a+53/5-10 = 0
3/5*a+3/5 = 0 // - 3/5
3/5*a = -3/5 // : 3/5
a = -3/5/3/5
a = -1
a = -1
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