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a in (-oo:+oo)
-(7*a)-10 = 2*a+98 // - 2*a+98
-(7*a)-(2*a)-98-10 = 0
-7*a-2*a-98-10 = 0
-9*a-108 = 0 // + 108
-9*a = 108 // : -9
a = 108/(-9)
a = -12
a = -12
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