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a in (-oo:+oo)
(2/7)*a+a+2 = 113/7 // - 113/7
(2/7)*a+a-(113/7)+2 = 0
(2/7)*a+a-113/7+2 = 0
9/7*a-99/7 = 0 // + 99/7
9/7*a = 99/7 // : 9/7
a = 99/7/9/7
a = 11
a = 11
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