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a in (-oo:+oo)
2*a+2/3 = 4/5 // - 4/5
2*a+2/3-(4/5) = 0
2*a+2/3-4/5 = 0
2*a-2/15 = 0 // + 2/15
2*a = 2/15 // : 2
a = 2/15/2
a = 1/15
a = 1/15
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