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a in (-oo:+oo)
7*a-(3*a)+16 = 1/5 // - 1/5
7*a-(3*a)-(1/5)+16 = 0
7*a-3*a-1/5+16 = 0
4*a+79/5 = 0 // - 79/5
4*a = -79/5 // : 4
a = -79/5/4
a = -79/20
a = -79/20
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