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a in (-oo:+oo)
-(6*a)-8 = 3*a-98 // - 3*a-98
98-(6*a)-(3*a)-8 = 0
98-6*a-3*a-8 = 0
90-9*a = 0 // - 90
-9*a = -90 // : -9
a = -90/(-9)
a = 10
a = 10
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