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a in (-oo:+oo)
98 = 5*a+3*a+2 // - 5*a+3*a+2
98-(5*a)-(3*a)-2 = 0
98-5*a-3*a-2 = 0
96-8*a = 0 // - 96
-8*a = -96 // : -8
a = -96/(-8)
a = 12
a = 12
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