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a in (-oo:+oo)
(5/6)*a-10 = -65/6 // + -65/6
(5/6)*a-(-65/6)-10 = 0
(5/6)*a+65/6-10 = 0
5/6*a+5/6 = 0 // - 5/6
5/6*a = -5/6 // : 5/6
a = -5/6/5/6
a = -1
a = -1
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