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a in (-oo:+oo)
(4/5)*a+7 = 53/7 // - 53/7
(4/5)*a-(53/7)+7 = 0
(4/5)*a-53/7+7 = 0
4/5*a-4/7 = 0 // + 4/7
4/5*a = 4/7 // : 4/5
a = 4/7/4/5
a = 5/7
a = 5/7
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