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a in (-oo:+oo)
(5/7)*a+6 = -8/7 // + -8/7
(5/7)*a-(-8/7)+6 = 0
(5/7)*a+8/7+6 = 0
5/7*a+50/7 = 0 // - 50/7
5/7*a = -50/7 // : 5/7
a = -50/7/5/7
a = -10
a = -10
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