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