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a in (-oo:+oo)
(4/7)*a = 40/77 // - 40/77
(4/7)*a-(40/77) = 0
(4/7)*a-40/77 = 0
4/7*a-40/77 = 0 // + 40/77
4/7*a = 40/77 // : 4/7
a = 40/77/4/7
a = 10/11
a = 10/11
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