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a in (-oo:+oo)
(1/5)*a+1/3 = 71/150 // - 71/150
(1/5)*a+1/3-(71/150) = 0
(1/5)*a+1/3-71/150 = 0
1/5*a-7/50 = 0 // + 7/50
1/5*a = 7/50 // : 1/5
a = 7/50/1/5
a = 7/10
a = 7/10
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