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a in (-oo:+oo)
(8/7)*a = -72/13 // + -72/13
(8/7)*a-(-72/13) = 0
(8/7)*a+72/13 = 0
8/7*a+72/13 = 0 // - 72/13
8/7*a = -72/13 // : 8/7
a = -72/13/8/7
a = -63/13
a = -63/13
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