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(1/2)*x+(4/7)*x+5 = 355/77 // - 355/77
(1/2)*x+(4/7)*x-(355/77)+5 = 0
(1/2)*x+(4/7)*x-355/77+5 = 0
15/14*x+30/77 = 0 // - 30/77
15/14*x = -30/77 // : 15/14
x = -30/77/15/14
x = -4/11
x = -4/11
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