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a in (-oo:+oo)
a+(1/3)*a+7 = 15 // - 15
a+(1/3)*a-15+7 = 0
4/3*a-8 = 0 // + 8
4/3*a = 8 // : 4/3
a = 8/4/3
a = 6
a = 6
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