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a in (-oo:+oo)
-68/5 = 4*a+3*a+2/5 // - 4*a+3*a+2/5
-(4*a)-(3*a)-68/5-(2/5) = 0
-4*a-3*a-68/5-2/5 = 0
-7*a-14 = 0 // + 14
-7*a = 14 // : -7
a = 14/(-7)
a = -2
a = -2
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