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a in (-oo:+oo)
(4/5)*a+7 = 34/5 // - 34/5
(4/5)*a-(34/5)+7 = 0
(4/5)*a-34/5+7 = 0
4/5*a+1/5 = 0 // - 1/5
4/5*a = -1/5 // : 4/5
a = -1/5/4/5
a = -1/4
a = -1/4
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