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a in (-oo:+oo)
3*a+1/5 = -29/5 // + -29/5
3*a+1/5-(-29/5) = 0
3*a+1/5+29/5 = 0
3*a+6 = 0 // - 6
3*a = -6 // : 3
a = -6/3
a = -2
a = -2
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