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a in (-oo:+oo)
(4/7)*a+a+10 = 202/7 // - 202/7
(4/7)*a+a-(202/7)+10 = 0
(4/7)*a+a-202/7+10 = 0
11/7*a-132/7 = 0 // + 132/7
11/7*a = 132/7 // : 11/7
a = 132/7/11/7
a = 12
a = 12
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