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a in (-oo:+oo)
(3/5)*a-((1/5)*a)+3 = 17 // - 17
(3/5)*a-((1/5)*a)-17+3 = 0
(3/5)*a+(-1/5)*a-17+3 = 0
2/5*a-14 = 0 // + 14
2/5*a = 14 // : 2/5
a = 14/2/5
a = 35
a = 35
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