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a in (-oo:+oo)
107 = 7*a+6*a+3 // - 7*a+6*a+3
107-(7*a)-(6*a)-3 = 0
107-7*a-6*a-3 = 0
104-13*a = 0 // - 104
-13*a = -104 // : -13
a = -104/(-13)
a = 8
a = 8
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