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a in (-oo:+oo)
7*a+10 = -6*a-107 // + -6*a-107
7*a-(-6*a)+10+107 = 0
7*a+6*a+10+107 = 0
13*a+117 = 0 // - 117
13*a = -117 // : 13
a = -117/13
a = -9
a = -9
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